Support for C bitfields in structs

[H-A-M-G-E-R]

example:

struct A {
    byte a:1;
    byte b:7;
};

[H-A-M-G-E-R]

Many GBA games use these, example: https://github.com/H-A-M-G-E-R/mf/blob/main/include/oam.h#L70

[gemesa]

#647

[H-A-M-G-E-R]

i didn't know that existed