Return file size-based progress values in Matroska reader
Return file size-based progress values in QuickTime MP4 reader
Refactored get_progress() in r_matroska.cpp and r_qtmp4.cpp
Return file size-based progress values in RealMedia reader
Return file size-based progress values in SubRip Text reader
Return file size-based progress values in Sub Station Alpha reader
Return file size-based progress values in Universal Subtitle Format reader
Return file size-based progress values in VobSub reader
Refactored common code into function-like macro
Use const refs wherever possible for progress_c args
Removed nasty function macros
Minor refactoring and readability improvements