Use QtClipboard for clipboard management

switch to using QtClipboard for clipboard management for better
cross-platform support
Add alt switch jump finder

Adds a GUI that lists switch jumps in a tree structure per subroutine.
Each switch jump can be expanded to see the cases and labels applied to
the case.
Merge pull request #9 from arbor-jjones/master

Use QClipboard for clipboard management, added user script for finding switches