Generic Ranged Training tree

[echo42]

Adds a generic ranged tree to the game. Archers start with it unlocked, all other classes can learn it from a trainer in Elvala.

https://te4.org/games/addons/tome/ranged-training

Talents:

Basic Ranged Mastery - a mastery talent that applies to all ranged weapons, but is slightly weaker than the specialized versions to compensate.

Basic Aim - a clone of the Aim skill. Cannot be used while Aim, Rapid Shot or Basic Rapid Shot are in use.

Basic Rapid Shot - as above, but for Rapid Shot.

Basic Steady Shot - A slightly weaker Steady Shot.

This should make it easier for non-archers to experiment with slings and bows. If there are any bugs, please don't hesitate to mention them (although there's no guarantee they'll be within my capability to handle - I'm no coder and cobbled most of this together from several different sources I barely understand). Might tune the power of some of the other skills down as well if it proves to be too powerful.