Enhancement: Add badge to README.md

Closes GH-613.

Update PHP version requirement

Closes GH-609.

Enhancement: Use PSR-4 autoloader (#604)

Test UserNotes\Sorter

We add a copy of the latest run-tests.php from the PHP-8.0 branch, and
tests for the `UserNotes\Sorter` with full code coverage. We also run tests
on GitHub Ac

Test UserNotes\Sorter

We add a copy of the latest run-tests.php from the PHP-8.0 branch, and
tests for the `UserNotes\Sorter` with full code coverage. We also run tests
on GitHub Actions.

Co-authored-by: Andreas Möller <am@localheinz.com>

Closes GH-606.

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Minor optimizations in CSS files to shed some weight (#612)

- Removes px suffix from 0px.
- Combines CSS properties where they are immediately overridden in the same selector block, or

Minor optimizations in CSS files to shed some weight (#612)

- Removes px suffix from 0px.
- Combines CSS properties where they are immediately overridden in the same selector block, or can be combined without side effects.

This saves about 50 bytes off the CSS scripts. it ain't much but it's honest work

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Postponement PHP Russia 2022 to November (#611)

HTML A11y improvements in add-note.php, my.php and vote-note.php

Also use strict comparison in pages that are changed.

Closes GH-610.

Micro Optimizations - Round #2

* .gitignore: Remove redundant entry

* Minor optimizations with ternary operators

* Use `const` instead of `define()` where appropriate

Micro Optimizations - Round #2

* .gitignore: Remove redundant entry

* Minor optimizations with ternary operators

* Use `const` instead of `define()` where appropriate

`const` is quite faster because of the compile-time optimizations. Because the replaced statements are not declaring constant conditionally, it's safe to use `const` in all of these places.

Closes GH-608.

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Multiple micro-optimizations

* Replace `ob_get_contents();ob_clean()` with `ob_get_clean()`

`ob_get_clean()` is equivalent to `ob_get_contents()` followed by `ob_clean()`.

Multiple micro-optimizations

* Replace `ob_get_contents();ob_clean()` with `ob_get_clean()`

`ob_get_clean()` is equivalent to `ob_get_contents()` followed by `ob_clean()`.

* Replace `intval()` calls with `(int)` type cast

This is a micro-optimization because `intval()` is a function call, and the type cast is about 6 times fast.

* Replace `preg_replace` call that could be done with an `rtrim()` call

In `./error.php`, there is a `preg_replace('!/+$!', '', $URI);` call that essentially is equivalent to `rtrim()`, that both calls removing trailing slash characters in `$URI`.
The `rtim()` call is more legible and faster.

* Combine consecutive `str_replace` calls to a single `str_replace` call

* Use short ternary operator where possible

Improves code readability.

* Cascade various `else` statements where possible

Cleans up the code by removing unnecessary `else` blocks and moving the code to the parent context if the previous `if` block exits the function by either terminating the script, or with a `return` statement.

* Combine multiple `isset()` calls to a single `isset()`

`isset()` accepts multiple parameters and returns `true` only if all of the parameters are `isset`. It makes sense to combine multiple individual `isset` calls to a single call for better readability.

* Replace `for` loop with a `foreach` loop

* Remove unnecessary character escapes in regular expressions

Regular expression special characters are context-sensitive. For example, special characters such as `.` are not considered special within square braces (`[]`).
This removes several of such instances that certain characters are escaped, but it is not strictly necessary within the context. This improves the readability of the expression.

See more information at [PHP.Watch: Writing better Regular Expressions in PHP](https://php.watch/articles/php-regex-readability#reduce-escape)

* Remove unnecessary break statement

* Remove unnecessary PHP close tags

* Remove redundant JSON_ERROR_NONE check

Remove unnecessary `json_last_error() == JSON_ERROR_NONE` where the decoded object is inspected already.

Closes GH-603.

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`phpversion()` replacements and code branch collapsing for older PHP versions

Closes GH-600.

Remove useless function manual_header()

Closes GH-584.

Announce SymfonyWorld Online 2022 Winter Edition conference

Closes GH-597.

Announce SymfonyCon Disneyland Paris 2022 conference

Closes GH-596.

Refactor manual_notes() (#592)

Move ManualNotesSorter to src/ (#593)

Use accent color for hero buttons (#591)

I've always wanted the accent to be used more, but it's kind of hard.
I think this is a great opportunity for it!

Fix: Move class into src/ (#581)

Avoid variable function invocation

Closes GH-586.

Fix: Remove extra closing tag

Closes GH-589.

Fix: Add type and return type declaration (#587)

Remove arguments identical to default values of parameters

Closes GH-583.

Inline unnecessary local variables

Closes GH-582.

Fix: Remove unused local variables

Closes GH-578.

Remove get_magic_quotes_gpc (#575)

Fix: Remove unused local variable

Closes GH-576.