feat(mac): rewrite mcompile for macOS 🐘

[SabineSIL]

fixes #7068 
 see #3345 
see #9384

This is a proposal to rewrite mcompile for macOS.

It will be a standalone implementation for macOS for now which is similar to the standalone implementation for Linux. (#9384)

To achieve this we can reuse most of the code from mcompile-Linux, especially the structure and the .kmx rewriting. We need to adapt the keyboard interrogation though. On Linux we use x11; For macOS we use the Carbon.h library.

Since we keep the structure of the code as it is on Linux, we only have to change the content of several functions, especially those that handle the keyboard interrogation and the mapping between Keycodes/Scancodes and Keyvalues.

Therefore for mcompile-mac we will first set up the the .kmx rewriting, then add the handling of non-deadkeys and in the last step add the handling of deadkeys.

Maybe in a next step we may combine the 3 versions of mcompile for Windows, Linux, macOS into a cross-platform version of mcompile.

@keymanapp-test-bot skip

[keymanapp-test-bot[bot]]

User Test Results

Test specification and instructions

User tests are not required

Test Artifacts

• Developer
  • Keyman Developer
  • Compiler Regression Tests
  • kmcomp.zip
• Keyboards
  • Test Keyboards
• Windows
  • Keyman for Windows
  • FirstVoices Keyboards for Windows
  • Text Editor (32 bit)
  • Text Editor (64 bit)

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