Add CLI features to configure Picture in Picture

[waydabber]

PIP should be fully configurable via CLI

[waydabber]

Turn PIP on/off of MyDisplay:

betterdisplaycli set -namelike=MyDisplay -pip=on

betterdisplaycli set -namelike=MyDisplay -pip=off

Move the PIP window to the screen MyDisplay2 (you can use any of the usual target specifiers):

betterdisplaycli set -namelike=MyDisplay -pip -targetnamelike=MyDisplay2

Move and resize the PIP window:

betterdisplaycli set -namelike=MyDisplay -pip -originx=20% -originy=40%

betterdisplaycli set -namelike=MyDisplay -pip -width=50% -height=50%

Configure various settings:

betterdisplaycli set -namelike=MyDisplay -pip -rotateby=90 -alpha=80% -showTitlebar=off

Available options:

freeAspect
rotateBy
flipHorizontal
flipVertical
cursorShown
partial
partialOriginX
partialOriginY
partialWidth
partialHeight
priority
showTitlebar
showShadow
alpha
autoStart
originX
originY
width
height