For some reason SDL.h (or headers included by it) need some string functions (like strncmp) in inline-functions (that we don't even use). Str.h has #defines preventing their usage.. so #undef those in the (few) sourcefiles that need SDL headers
mostly -Wreorder, use const char* instead of char* for "static strings", fix inappropriate usage of NULL (e.g. instead of '\0' or (int)0)
