Remove unused private member
Improve the edit box tooltips
Add 64-bit installer script
Create the output directory for the portable installer if it doesn't exist
Remove MPC-HC VSFilter from the portable installer files
Fix the paths in the PortableInstaller filters
Add the en_US dictionary to the portable installer
Fix unicode issues in the karaoke split/join bar

Use ICU to split the text into characters rather than assuming that one
wchar_t == one character in some places, and one char == one character
in other places.
Fix crash when clearing the contents of one of the Margin boxes
Extract some common helper methods to auto4_lua_utils.h
Replace wxRegex bindings for lua with boost::regex bindings

API is mostly unchanged other than the addition of a lot more flags.
Should be less buggy since it has an actual test suite, and generally
has a more powerful regex syntax with better support for Unicode.

The bindings are written in MoonScript. For now the compiled form is
store in the repo for convenince.