Rogue rework update

• Rogue's Artfice tools update:

Significant rewrite of artifice talents, eliminating parallel code. Adding new tools is now much simpler.

Talent descriptions are more complete and clear.

NPC's can use all tools, including Master Artificer, and will automatically select what to prepare at random the first time they try to use talents.

Tools automatically use and benefit from the mastery level for the "cunning/artifice" tree. Added some missing stamina costs.

Chat dialogs display the changes in the associated talents in their tooltips, and allow the player to cancel the action with no penalty.

Rogue's Brew scaling corrected (does not depend on maximum life).

Assassinate grants only physical resistance penetration (slight nerf), errors are trapped to prevent any possible permanent buffs.

Only actors can get Backstab damage bonuses.

Updated some new DamageTypes to display in the combat log as appropriate.

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

@@ -700,7 +700,7 @@ function _M:getTalentLevel(id)
 	else
 		t = _M.talents_def[id]
 	end
-	return (self:getTalentLevelRaw(id)) * ((self.talents_types_mastery[t.type[1]] or 0) + 1)
+	return t and (self:getTalentLevelRaw(id)) * ((self.talents_types_mastery[t.type[1]] or 0) + 1) or 0
 end
 
 --- Talent type level, sum of all raw levels of talents inside