Thanks to a reddit user, I was able to fix a bunch of mutex issues I overlooked! Tests now properly work as well

• Completely rewrote the library to use ANSI C89, and compiling in that mode, however with extensions you get type checking, and additional features such as mc_auto.
• Threading support! Mutexes are fully implemented on POSIX and Windows
• Safety improvements across the board
• Dynamically grow-able list (that doesn't break existing references!)
• Consistent naming
• Clang extensions! mc_defer for defer functionality
• Proper testing
• Many more changes I can't remember!

Full Changelog: https://github.com/Frityet/ManagedC/compare/v1.5.0..v2.3.0

Total API change!

I somehow accidentally deleted the "reference count" checks, sorry!