Add menu item/key code for configuring input

[jefflunt]

Allow users to either select a menu item or press a special key to enter the input configuration steps.

This should allow easy, in-GUI reconfiguration of a custom controller.

[jefflunt]

The most graceful way to do this is going to be to remove the file and then create a new InputConfig manager that checks for input configs and tries to re-run them.

If that doesn't work we'll have to remove the file, then restart glint-es

[jefflunt]

Tried making a menu item that removed the config file and then restarted glint-es - never really worked at all. Tried simply restarting the config code but that proved problematic as input would bleed over from the keyboard.

Punting this issue for a later time.