Update libpng to 1.2.50 so it can be built with Clang 3.2
Adjust some files being built or not to fix clang on Android.
Clang uses __clear_cache instead of __builtin___clear_cache like GCC
Fix clang building the std headers.
Android Clang doesn't support TLS, so do the same thing as OSX.
Update AndroidManifest to v0.2
Update translation files from Transifex, and update the pot file from
the source code again.
Update the ant files to build the APK from terminal
Add a fastmem option for enabling and disabling fastmem at runtime.
Fix a bunch of random typos in comments and logging.

Also update the comment headers for two functions in GCMemcard.cpp.
Enforce landscape view since rotations cause huge issues atm.