Made sliders transparent. This is the first change that requires MinGW-w64 4.0; adding a check for that comes next.
Made sliders transparent. This is the first change that requires MinGW-w64 4.0; adding a check for that comes next.

ProtonMail/libui,tbodt/libui,sclukey/libui,mantyr/libui,sclukey/libui,ProtonMail/libui,mantyr/libui,ProtonMail/libui,mantyr/libui,tbodt/libui