Extendable TabPage system

[kkjamie]

The debug menu currently has the root page containing the actions as well as some other pages, Logs, BuildInfo, BugReport etc... Theres no easy way to quickly add your own pages into your project (or extending the default pages that we ship with the system). I propose a simple refactor to allow us to drag a new game object in and the menu can create it's own tab buttons for it and hook into the APIs as needed