64 bit warning and string format fixes.

[KosmicTask]

This pull ups the warning levels to -Wall and -Wextra. We have nothing to loose by going that bit further and it gives a warning free build on 32/64 bit targets.

I was moving my app from 32 -> 64 bit and I was determined to eliminate as many warnings as I could in the hope of getting 64 bit up and running.

See this http://programmers.stackexchange.com/questions/122608/clang-warning-flags-for-objective-c-development. -Wextra might be a bit far but it doesn't hurt too much.

I fixed all the 64 bit type size and string format warnings as recommended in the Apple 64 bit transition guide. I think they should be merged even if the -Wextra changes are rejected.