Set BPM feature, disable visuals behind UI, plus small fixes

Two feature requests fulfilled this week, and several bug-fixes. Keep reporting / requesting them! [h3]For this update we have 2 new features:[/h3] - It's now possible to set the BPM directly from the "Set" tab. It even has a "with audio" feature that still uses our automatic bpm detection algoritm to precisely line up the given BPM to the beats! (thanks zeepkoe & Henk for the request) [img]{STEAM_CLAN_IMAGE}/45046679/80aaafcb12c2310ebe4fccdb0f056351f1981bc0.png[/img] - To accomodate lower spec machines it's now possible to forego eye-candy & always having an eye on what's on-screen, and disable visuals rendering behind the UI. This should make AI VJ run with almost the same performance with a second display as it does with a single (thanks for the request Habbening) You can find it in the Main menu, under Display! [h3]And several smaller fixes:[/h3] - No more (rare) crashes on starting AI VJ when having disconnected a saved audio input device. It now defaults to auto-detect in that case (thanks for reporting zeepkoe) - When tapping the beat, you now get a warning if you tap slower than once per second and it assumes you've stopped tapping (thanks for reporting Anne) - "Exit" within the menu is now called "Exit AI VJ" for clarity (thanks for reporting Anne) [h3]Join us on Discord!:[/h3] Feature requests & bug reports are welcome. Either here or on [url=https://discord.gg/DQZHJyDebC]our discord[/url]! Oh, and Live Fractal Visuals was released yesterday! Something different! https://store.steampowered.com/app/2941700/AIVJ__Live_Fractal_Visuals/