Migrate skip checks to --EXTENSIONS--, p1

For rationale, see https://github.com/php/php-src/pull/6787

Extensions migrated in this part:
* bcmath
* bz2
* calendar
* c

Migrate skip checks to --EXTENSIONS--, p1

For rationale, see https://github.com/php/php-src/pull/6787

Extensions migrated in this part:
* bcmath
* bz2
* calendar
* com_dotnet
* ctype

Closes GH-6797.

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Improve error messages of various extensions

Closes GH-5278

Make error messages more consistent by fixing capitalization

Closes GH-5066 As a first step, let's capitalize their initial letter when it is applicable.

Add type error on filename which contain null bytes in bzopen