Backtracking && Misc

Added backtracking behavior with two settings (start of combat and
missed items)
Added event to character position change
TargetMovement no longer static and is now property of Target class.
Unit health check fix

Changed the check to use LastUsedACombatAbility instead of
LastUsedAbility.
Backtracking UI Settings

Added under General Tab
Stat Tracking

Finished implementing properly so that it tracks each game and the total
of every game.
Disable Backtrack Starting UI

Test by manual enabling using setting file