Scrcpy Command Line Flags in the GUI

[SentaiBrad]

To increase performance for some apps and some games, being able to pass over command line flags via the GUI would be awesome. For example "scrcpy -m 1280 -b15m --no-control --render-expired-frames --prefer-text". Things like prefer-text is already included as a toggle option, and I do thing as many options should be added in that fashion with a quick description and why you might want it, but a field to enter custom commands would be awesome.