In-Game HUD: Convert vanilla HUD elements

[vrad-exe]

Portal 2's vanilla HUD elements should be converted to Panorama to enable them to be customized and get rid of more VGUI. Off the top of my head, this would consist of:

• [ ] Crosshair (the middle section which appears regardless of your weapon)
• [ ] Portal gun crosshair bars (quickinfo)
• [ ] Radial menus for gesture, ping, perhaps paint gun?
• [ ] Challenge mode HUD (if/when P2CE has challenge mode)
• [ ] Remote view/PIP (maybe, it's rather special though since it renders the world)
• [ ] game_text/HUD messages
• [ ] Game instructor
• [ ] Saving indicator (Revolution did this already)
• [ ] Closed captions/subtitles
• [ ] ~Cheaptitles~ (merge with standard captions)

The visual designs should be kept the same as the base game, unless there's a specific reason to change or improve them.

[AWildErin]

I have some code written up for a dynamic radial type wheel for the paint gun menu. I can probably clean that up, get it fully working for the gesture and ping wheel.

[vrad-exe]

Just added a few more things I realized I forgot about, would be nice if someone could go and check if there are any other Portal 2 HUD elements I forgot to list