Fixes some file handling in IPC_HLE

* change File::GetSize to fetch the size directly from the open file instead
  of stat'ing it when challed with a FILE*
* use changed File::GetSize(FILE *f) instead of calling with file name in two
  places
* remove "seek_pos % file_size" hack for ZTP, so one can seek to the end of
  file again. Please check Zelda: Twilight Princess for regressions
* return error codes when reading or writing from/to a file

A lot of those changes are from j4ck.fr0st, so kudos to him.

I did not change the file open mode for ISFS_OPEN_WRITE to "wb". While that
would probably be more correct, it says in the comment that it might affect
Mario Kart Wii. I would prefer somebody with that game try that change
locally first.

Please check your games for regressions (or even improvement). Some games that
may be affected are Zelda - Twilight Princess and Metroid Prime 3.

Fixes issue 1749



git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6634 8ced0084-cf51-0410-be5f-012b33b47a6e

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