[Feature Request] Add controller support to the web ui

[Samsagax]

Since HTML5 Gamepad API is widely adopted among modern browsers we should support it to enable the web app to be used inside the ChimeraOS device itself. That could enable us to migrate to a store-like UI for other platforms and maybe embed this app as a OS-manager accessible as a tool.

Here is the specification itself: https://www.w3.org/TR/gamepad/
A help from Mozilla: https://developer.mozilla.org/en-US/docs/Web/API/Gamepad_API
And a usage example: https://github.com/luser/gamepadtest