[IMPROVEMENT] UX for close window button of the player about racecontrol

[robvdpol]

I added a checkbox to disable MPV borderless mode. It still plays nicely with loading of layouts, so that's good.

[bossanovaorca]

to add onto this, it seems that since the title bars were removed from the external mpv windows, it became impossible for me to use Win + arrow keys to snap the player window to edges of my monitors. would it be possible to bring back title bars on mpv player windows (maybe as an option)?

[robvdpol]

I rarely use the close button since pressing the escape button also works. I just added a shortcut to close all player windows using shift + escape. Will close this issue for now.