Linux support

[Avasam]

Support for other OS is important. Not possible at the moment. Completing #32 first would help a lot.

[Avasam]

Things left to do on Linux:
https://github.com/Avasam/Auto-Split/tree/linux

• Figure out the intermittent Segmentation Fault (core dump) when trying to set a hotkey
• Warn the user with instructions if they need to be in input group
• need to fix the PyInstaller build with keyboard: dumpkeys tries to run during pip install on linux boppreh/keyboard#563 OR How to add the Ubuntu image's running user to groups? actions/runner-images#5981
• Investigate SCROT performance (see -a option for scrot asweigart/pyscreeze#68) Moved to Linux SCROT performance and maim #44
• Multiple-monitors support (with weird position/configuration) Moved to Linux multiple-monitor support #40
• Test numpad hotkeys
• Test hotkey modifiers
• Make the webcam capture work (might be VM issue?) Moved to Linux capture device support #41
• Select top window instead of any window at selection WIP: Feature request: getWindowAt Kalmat/PyWinCtl#20
• Windows Shadows/Borders are a thing too on linux (ie: using finder) Moved to Linux: Detect window shadow and adjust region #42

MacOS support issue moved to: #43