Implement collective debounce across all controls on a button binding…

…, along with displays for collective value on bindings (#637)

* Add parameter serialization for control bindings

* Factor out debounce timer into its own class

* Allow debouncing collectively across all bindings on a button

* Organize and clarify names of single-bind views

* Use control's press point for determining whether or not to write it

* Give each binding type its own bind header (and rename headers to groups)

* Contain binding views into their respective groups, and make groups collapsible

* Improve performance of switching game mode tabs somewhat

* Don't forget to update collective debounce on each frame

* Add overall current value displays to bind groups under a settings drawer

* Add debounce to button bind group settings

* Separate button press indicators into a dedicated component

* Change the icon used for the bind settings button

* Change default debounce to 5 ms

* Fix some comment ordering

* Fix add bind dialog not working correctly

* Don't forget to apply binding parameter defaults to new bindings