I'd like to use the menu and grip controller buttons

[keianhzo]

Is your feature request related to a problem? Please describe.
At the moment we are only using the menu and grip (where available) inside immersive mode. I think we could find more uses for them inside the app.

Describe the solution you'd like
The first use I can think of is opening the settings panel for the menu button and opening acontext menu for the grip button when the window is focused (a desktop style right-click menu)

[jvonitter]

@keianhzo can you make an apk with your suggested changes for us to play with? i think this could be a good idea, but want to see if we get a lot of mistaken activation of the grip button.

[jvonitter]

cc @thenadj