Nintendo DS screen layout switcher
A basic screen layout switcher. It just sets desmuume_screens_layout option, so it only works with DeSmuME and DeSmuME 2015 cores, but not MelonDS or any potential other cores. When GNOME/retro-gtk#15 is fixed, we can easily change it to offer other options and to make it work with any core.
Screenshots:
Needs icons!
Update: @aplazas did the icons, and we've removed popover in favor of just linked buttons:
Also added right/left in addition to left/right.
Fixes a part of #13 (closed)
Update: back to popover, added quick switch, keyboard and gamepad shortcuts.
Keyboard shortcut depends on GNOME/retro-gtk!30
Edited by Alice Mikhaylenko