add default account property and commands associated with them
add a bit of default account autocomplete
finish /account default ac
add some tooltip messages for /account and /connect
/connect supports default account
removing the account connected to the default account removes the default account as well
added warning about options not being used
Added CHANGELOG
update CHANGELOG
Added caching of legacy capabilities
Only overwrite preferences with theme when them loaded, not on startup
Colour /me messages correctly

fixes #457
Automatically add/remove '/' when adding and removing aliases
Fixed spelling in themes
Fixed /me messages in chat room history
Added ctrl-w support (with debug)
Added ifdef to _show_privacy() function
Removed debug
Updated navigation help
Fixed closing window 0