Changed some types to lower the amount of int/size_t inconsistencies. This might have introduced some stupid bugs... beware!
Removed old, unused "project file" code. (cleanup)
Fixed bug #195: "Join (as karaoke)" is broken when 2 lines don't follow immediately after another
Implemented feature req #184: Text Only Export
Fixed bug #180: conversion from srt to ass doesn't specify WrapStyle
Implemented feature req #188: highlighting of currently selected style in the styles manager
Originally committed to SVN as r537.