Everytime List.h is included in a new file (and sys/platform.h isn't)
there are confusing compiler-errors..
So just #include sys/platform.h in List.h directly, because it uses
ID_INLINE which is defined there
GCC had shitloads of superfluous warnings wherever List.h and Str.h were
included.. get rid of them by using #pragma GCC diagnostic at some places
in List.h and Str.h.
Also add some casts, initialize some variables for other warnings
