Physical bidding round

[Fueredoriku]

• Create a physical bidding round scene
• Integrate bidding round to MatchManager (It redirects to bidding after each round)
• Created new inputMap specifically for bidding
• Merged playerInventory into playerManager

I intentionally chose not to track bidding rounds like we do rounds, with the reasoning being the following

• Results of the bidding round only affect a player's inventory, which should be stored in PlayerManager.
• I have yet to come up with a good use case for tracking the result of every bidding round from a match.
  • If such a use case is found, it wouldn't be hard to refactor the code to allow for similar functionality as Round

[toberge]

LGTM for a temporary, nonfunctional version of the bidding scene. I've left a few comments.