- fix: speech was not paused during pause menu
- fix: allow sound levels to reach min value 0.0 (=muted)
- fix: crash was happening when switch language during the game
* fix: manage clearing of current_action when action is interrupted
* fix: repairs change_scene, add comments and new RC_INTERRUPTED code
* fix: manage ESC commands interruptions, even if running
This commit was started by copying `addons/escoria-ui-9verbs` as the
basis for `addons/escoria-ui-keyboard-9verbs`. It was then amended to
wire up keyboard shortcuts for each verb using the new
`register_custom_input_handler()` API.
Note that `addons/escoria-ui-keyboard-9verbs/input_map.gd` introduces
one action per verb and provides a `add_actions_to_input_map()`
function to add the actions to the `InputMap`. The `_process_input()`
function in `game.gd` is responsible for mapping each action to the
appropriate call to `verbs_menu.on_action_selected()`.
