* Pak_InitDecoder() now takes the output buf and mask as parameters.
* Pak_InitDecoder() checks if provided masks are a power of 2 (required).
* Pak_ComputeRingBufferFrame() now uses the bit mask instead of modulo to determine # bytes used.
* Fixed a bug where PakDecoder_t::bufferSizeNeeded could be bigger than the file stream, causing a deadlock.