Removed broken hyperlink and message prefixes.
Added copy functions for Lua tables.
Fixed issue with settings in sub-groups.

The settings were not flagged for sorting in every case, so they were
not included and not processed properly.
Attempting to diversify hotkeys.

This is a small improvement over the default key shortcut processing,
but it is still not what I want/need.
Switched to new QKeySequenceEdit widget

No longer have a particular need for the third-party QKeySequenceWidget
Lua XML import returns a simple boolean

It would be great to make the import/merge code return the number of
updated settings, but the code started getting messy, so this is all I'm
doing for now.
QKeySequenceWidget superseded by QKeySequenceEdit
Merge branch 'master' of https://github.com/jkdoug/mudder