Previously only the list of allowed keymaps could be modified and
applied to the system.
Add a new button to activate the selected keymap from the list. When
applying the changes to the system, also apply the active keymap.
Now that the GML formatter is both perserving comments and also mostly
agrees to the existing GML style, it can be used to auto-format all the
GML files in the system. This commit does not only contain the scripts
for running the formatting on CI and the pre-commit hook, but also
initially formats all the existing GML files so that the hook is
successfull.
Right now, this is a bit of a hack. We can't set a keymap to only apply
to the test area, so we set the system keymap instead, while also
keeping track of the "real" current keymap. Whenever the settings are
applied, we update what that "real" keymap is, and when we exit, we
revert to that keymap.
Basically, it behaves as you would expect, apart from it also affecting
other applications you are typing in while the KeyboardSettings window
is open with a different keymap selected.
