help dailog locks main window

[Dave Baier]

When the help dialog is open, the main window is unusuable. On a two monitor system - its nice to be able to leave the shortcuts dialog open while continuing to work in the main window.

[Benjamin Knorlein]

fixes #112 #95 : Opens XMA files directly (still needs testing on MAC) and help dialog not blocking

→ <<cset b86468256095>>