Added the Excellence tree to Archers, granting them more utility and survivability

game/engines/default/engine/Projectile.lua

game/engines/default/engine/Target.lua

game/engines/default/engine/interface/GameTargeting.lua

game/modules/tome/class/interface/Combat.lua

game/modules/tome/data/birth/classes/warrior.lua

game/modules/tome/data/gfx/talents/bull_shot.png

game/modules/tome/data/gfx/talents/intuitive_shots.png

game/modules/tome/data/gfx/talents/shoot_down.png

game/modules/tome/data/gfx/talents/strangling_shot.png

game/modules/tome/data/talents/techniques/excellence.lua

game/modules/tome/data/talents/techniques/techniques.lua