We need to rethink app launchers. Shortcuts make no sense on non-Windows systems, plus they keep confusing users - remember how many people have trouble getting a shortcut for xEdit cleaning to work.
On top of all that:

• syscalls on boot
• will make profiles more complex - Profiles #250
• app_buttons.py is very ugly

Instead, I think a more usable solution is using our settings dialog to implement a page where you can add custom launchers (along with some default ones that we auto-detect, most likely). Or a new tab? Not sure yet.
We can then even generalize concepts like the special links that the BOSS launcher has by allowing users to add right click options that will enable or disable custom CLI flags.
And a toggle on each link to allow suspending Lock Load Order while that app is running, etc.

Ref #178, #250