Random fixes aarch64 / macos / unix

[Fusioon]

Bunch of stuff I encountered while trying to get IDE to work on macos.
List of changes:

• add #version 150 core (opengl 3.2) to opengl shaders and update code so that it loads (macos refuses to load shaders without #version pragma)
• Ignore unused variable in MethodInfo.bf on aarch64
• use BfpDynLib_Load / BfpDynLib_GetProcAddress instead of platform dependent functions to load SDL3
• Add missing include dir for ImgCreate on macos
• Reworked FileWatcher allocation on unix so that any new implementation just needs to implement FileWatchManager::Allocate() it should also fix potential double allocation in multi threaded situations.

Now for IDE to build on macos there are 2 missing pieces, which will come in near future

• File Watcher
• File Picker dialogs