feat(developer): Debugger platform option

Relates to #5013.

Adds a debug status page to allow the user to select an alternative
platform so they can debug rules relating to those platforms which
are constrained by the `platform()` statement in the keyboard source.

Note that while touch platforms are listed here, there is not yet any
method of activating touch key events (e.g. `[T_foo]`). This
functionality is planned for a future update.