Adds the following changes:
- renames "key:globalhotkey" to "app:globalhotkey"
- adds globalhostkey documentation (especially in regard to what keys are allowed)
- improves the algorithm that converts electron keybindings from wave keybindings
- fixes some regexp problems
Sets up a configurable global hotkey to focus the last window used in
the application. Note that this is established at startup and
configuration changes will not be applied until rebooting the app.
