Update code to use LogPriority::NOM_LOG_PRIORITY enum values
Refactor input subsystem to use nom::InputMapper feature

The entire game has (finally!) been moved 100% over to a run-time
configurable action binding input subsystem. This change greatly
simplifies the events handling logic and reduces duplication
considerably.

* Joystick input handling has been implemented in every state now.

* Modifying card rank values no longer exhibits the cursor hopping bug,
due to clean up of InputStateMapper in nomlib.

* A couple other minor improvements that I can't think of at the
moment... (ContinueMenuState && GameOverState is all that comes to
mind...)

* debug.hpp: Introduce TTCARDS_LOG_CATEGORY_EVENTS enum value.