PUN shooter #15 - Core experience fixes

Even a simple shooter without perks may need fixing.

I temporarily disabled battle mode because it felt broken. I don't want it to stay down for long though, because it can be fixed.

This put the emphasis back on survival mode which at the moment is the most accessible game mode.

Note: When a player enters, they should see a notification if the game is 'empty' at least until we can substitute some kind of fun.

One issue with survival mode is that the progression implicit to battling other players is not obvious enough:

• A player should see their rank when they enter the game.
• I think we'll be showing a leaderboard with daily ranks when a player lose (should also be visible from the main menu)
• A player should see notices, or a short narrative, possibly during or after they battle enemies they encountered before. For example: "This guy is a wimp, he's only ever won x times" or "This is the guy that done you in last time. Time for payback" or "You got busted xx times today".

Also, it looked like the ranking system was broken (but not the number of win/losses) but this is unconfirmed. Maybe data gets deleted when replacing the web player or clearing the history?

Too many players are asking for mouse look and overall more conventional controls.