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