Use bool instead of _Bool (may cause compilation error for Objective-C++ code)

Apparently, Objective-C++ code may have troubles with understanding `_Bool` type. I guess it has something to do with `<stdbool.h>` not being included. Or maybe not. Anyway, I believe it should be fine to just use `bool` instead. It's not like all this makes much sense for Masonry, but still.

I also moved `float` and `double` a bit higher because they *do* make sense for us :)