Export the string functions from utils-auto4.lua
Fix calls to other util functions from within util functions
Use agi::line_iterator for loading keyframe files

line_iterator supports Windows newlines on non-Windows platforms, unlike
istream_iterator.
Use std::this_thread on Windows to avoid having to build boost.chrono
Fix ipairs on tables
Don't build the automation tests helper so by default
Add LPeg 0.10

0.11 has a bug that makes it crash on MoonScript, and 0.12 is much slower.

LPeg isn't packaged as a C library and consists of a whopping two files
so just compile it as part of Aegisub.
Add native support for MoonScript
Update installer files
Fix non-pch compilation