Dependency Handling from vmlinux and struct generation

[varun-r-mallya]

This should also provide an architectural model for separation of semantic checks from IR generation for the rest of the project to follow in the coming future.

[varun-r-mallya]

in #28 I forgot to take into account function pointers. TODOing this for now
Example:

btf_bpf_sock_addr_getsockopt = ctypes.CFUNCTYPE(ctypes.c_uint64, ctypes.POINTER(struct_bpf_sock_addr_kern), ctypes.c_int32, ctypes.c_int32, ctypes.POINTER(ctypes.c_char), ctypes.c_int32)

[varun-r-mallya]

I also forgot to take unions into account. They are currently considered to be normal classes, so idk anymore.

[varun-r-mallya]

breaks when from vmlinux import struct_dquot