Added comment about things to fix.
Removed some fields that are not needed. Added doc.
Modified the code to make it more general.

Less things hardcoded:
  - Wild die can change
  - Advance damage can change (this will simplify testing)
  - Modifiers for aim or wild attack are taken into account in a
   simple and general way.
Changes to accommodate the new class for jobs.
Added a panel to choose the aim of the attacker.

With past commit, this ensures that the attack takes all the relevant
modifiers into account.
An enum for the aim.