Screensaver Support

[OfficialIncubo]

In the next version, BeatDrop will run as a screensaver (same as .exe file), but the differences are:

• The screensaver starts only on fullscreen, not windowed.
• No key and mouse interactions (such as L - Load Preset, F7 - Always On Top, Scrolling the Mouse Wheel to load next and previous preset etc.)
• Exit the program (or screensaver) by pressing any key, clicking/moving the mouse or the monitor is off.
• No resetting sleep idle timeout.
• Preset cycling is in RANDOM
• Preset duration isn't locked while running as screensaver.
• Not showing "Press F1 for help" or "scanning presets..." while the screensaver started running.

[OfficialIncubo]

Referencing... https://github.com/milkdrop2077/MilkDrop3/issues/22

...but continue here.