Adds a generic ranged training tree to the game. Archers start with it unlocked, all other classes can purchase it from an archery trainer in Elvala. Basic Ranged Mastery applies to all ranged weapons, but is weaker than more specialized masteries to compensate.

Adds the Mobility Generic Tree to:
- Rogues (Locked, 1.3 mastery)
- Skirmishers (Unlocked, 1.1 mastery)