Update Windows 64-bit Hunspell, thankies Drake~
Portability Mode!

Just add --portable to the shortcut
or use the provided shortcut as a template,
though it's likely the provided shortcut will not work on other computers, because the drive letter will change
Introduce debug setting, LiruNewMessageSoundIMsOn, for defaulting ding of new IMs on.

This setting is off by default and I don't intend to give it a gui yet.
It probably will go in Chat UI, eventually.