Optimize mb_str{,im}width for performance

Rather than doing a linear search of a table of fullwidth codepoint
ranges for every input character,

1) Short-cut the search if the co

Optimize mb_str{,im}width for performance

Rather than doing a linear search of a table of fullwidth codepoint
ranges for every input character,

1) Short-cut the search if the codepoint is below the first such range
2) Otherwise, do a binary (rather than linear) search

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Combine control into one character group

Same as with punct, we're currently not interested in distinguishing
between Cc and Cf, so only store their union.

Combine punctuation into one character group

We're not currently interested in distinguishing between
individual punctuation types, so just merge everything into one
general category

Combine punctuation into one character group

We're not currently interested in distinguishing between
individual punctuation types, so just merge everything into one
general category to make the property lookup more efficient.

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Don't use sentinel value for unicode property lookup

0xffff was used to mark character properties without any members.
This made the code unnecessarily complicated, because we need to

Don't use sentinel value for unicode property lookup

0xffff was used to mark character properties without any members.
This made the code unnecessarily complicated, because we need to
check for 0xffff values when looking up the property ranges. We
can simply encode this as an empty set of ranges.

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Update 'East Asian Width' table to comply with Unicode 13.0

Instead of manually maintaining the data in eaw_table.h, it is now automatically
generated by ucgendat/ucgendat.php, using the

Update 'East Asian Width' table to comply with Unicode 13.0

Instead of manually maintaining the data in eaw_table.h, it is now automatically
generated by ucgendat/ucgendat.php, using the EastAsianWidth.txt file from
the Unicode Consortium.

Something must be said about the deleted test case. Back in 2004, someone
noticed that `mb_strwidth` didn't comply with Unicode 4.0. A test case was
added to expose the problem. Well, time keeps moving on, and with the changing
years, new Unicodes are born and old Unicodes die. Some characters which were
counted as double-width in Unicode 4.0 are no longer such in Unicode 13.0,
which renders the test case obsolete.

At the same time, make a couple of spelling/grammar fixes in ucgendat.php.

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Move ucgendata README to generator file header

Trim trailing whitespace in source code files

Trim trailing whitespace in source code files

Make PHP development tools files and scripts executable

This patch makes several scripts and PHP development tools files
executable and adds more proper shebangs to the PHP scripts.

Make PHP development tools files and scripts executable

This patch makes several scripts and PHP development tools files
executable and adds more proper shebangs to the PHP scripts.

The `#!/usr/bin/env php` shebang provides running the script via
`./script.php` and uses env to find PHP script location on the system.
At the same time it still provides running the script with a user
defined PHP location using `php script.php`.

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Fixed bug #65544 and #71298

Implement full case mapping

Implement full case mapping according to SpecialCasing.txt and
also full case folding according to CaseFolding.txt (F). There
are a number of caveats:

Implement full case mapping

Implement full case mapping according to SpecialCasing.txt and
also full case folding according to CaseFolding.txt (F). There
are a number of caveats:

* Only language-agnostic and unconditional full case mapping
is implemented. The only language-agnostic conditional case
mapping rule relates to Greek sigma in final position
(Final_Sigma). Correctly handling this requires both arbitrary
lookahead and lookbehind, which would require some larger
changes to how the case mapping is implemented. This is a
possible future extension.
* The only language-specific handling that is implemented is
for Turkish dotted/undotted Is, if the ISO-8859-9 encoding
is used. This matches the previous behavior and makes sure
that no codepoints not supported by the encoding are
produced. A future extension would be to also handle the
Turkish mappings specified by SpecialCasing.txt based on
the mbfl internal language.
* Full case folding is implemented, but case-insensitive mb_*
operations continue to use simple case folding. The reason is
that full case folding of the haystack string may change the
position at which a match occurred. This would have to be
mapped back into the position in the original string.
* mb_convert_case() exposes both the full and the simple case
mapping / folding, where full is the default. The constants
are:

* MB_CASE_LOWER (used by mb_strtolower)
* MB_CASE_UPPER (used by mb_strtolower)
* MB_CASE_TITLE
* MB_CASE_FOLD
* MB_CASE_LOWER_SIMPLE
* MB_CASE_UPPER_SIMPLE
* MB_CASE_TITLE_SIMPLE
* MB_CASE_FOLD_SIMPLE (used by case-insensitive operations)

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Use case-folding for case insensitive comparisons

Instead of using lowercasing.

Use MPH for case maps

Instead of performing a binary search, use a hashtable to store
the case maps. In particular a minimal perfect hash construction
is used, which does not require

Use MPH for case maps

Instead of performing a binary search, use a hashtable to store
the case maps. In particular a minimal perfect hash construction
is used, which does not require collision resolution (but does
use an auxiliary table for the hash perturbation).

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Don't store titlecase if same as uppercase

The totitle code already has a fallback for that case.

Drop implementation-specific character properties

No point in keeping around non-standard character properties if
we're not using them and most are not even being populated.

Handle character ranges in ucgendat generically

In particular, the previous implementation did not account for
Tangut Ideographs and CJK Ideograph extensions C through F.

Port ucgendat to PHP

Implemented such that the output is identical, including some
quirks that should be fixed subsequently.