Fix docs.

- fixed ANSI (C89) issues, including #418

Added num_elements parameter to docs for TEST_ASSERT_INTn_ARRAY_WITHIN

Convert RUN_TEST() to a function

Converting RUN_TEST() from a macro to a function significantly reduces the size
of the compiled binary.  On amd64, the largest test runner in the test suite
(testsample_DefaultsThroughCommandLine_runner.o) was reduced from 3.4 kB to 2.4
kB (stripped).

Meson support upgrade to version 0.52.0.

Adding basic ignore entry for example and main build directories.

Adding Meson build script into hit attributes as text.

This is because Meson now has better support for static libraries.

Update CMakeLists.txt minimum version

Update the CMAKE minimum version from `3` to `3.0` to fix error in Windows 10 x64 with CMAKE 3.15.4:

cmake_minimum_required could not parse VERSION "3".

Fix "rake scripts" when running on Windows.

Fix Meson build system support.

Update CMake support.

Fix malloc alignment (Thanks @alecoding )

Fix compiler complaint about declaration after statement

The realloc was not taking in account extra bytes needed for the the pointer proper alignment

Make sure the malloc alignment is always aligned to the architecture's pointer size

Fixed a simple mistake.

Removed Unity version number from Meson build scripts so there is one less thing to change when doing updates to this script.

Added new CMakeLists.txt here in the src dir, moved add library method from root script to sub script.

Moved the add library method into sub dir.  Also made this CMakeLists.txt script compatible for versions os CMake starting from 3.x and up.