Gyroplatter/keep launcher open

[gyroplatter]

Added a new checkbox to minimize the Launcher after clicking 'Launch', and restore it after exiting Falcon BMS.exe.

SaveUISetup() is now also run on launch click, just in case users make changes without running BMS.

[arithex]

I don't remember if we discussed this one already -- WPF does use GPU for rendering, by default.. it probably isn't any more impactful than having some browser tabs open.

Except.. it also uses a timer-thread to poll for DirectInput events and hardware changes.

If we're going to offer this as an option, we should disable that timer (or turn its frequency way down) when the AL window is minimized.

[gyroplatter]

In the new bindings build I'm working on, the polling rate stays high when assigning a key/axis, drops to a lower rate when just viewing the controls tab, then stops when the user is on another tab.
I can work on applying that same logic here.