Add the ability to disable a tradeskill recipe
Merge pull request #87 from Leere/recipe_disable

Add the ability to disable a tradeskill recipe
Added in-game commands to enable/disable tradeskill recipes
-Commands: #enablerecipe recipe_id, #disablerecipe recipe_id
-Perl: quest::enablerecipe(recipe_id), quest::disablerecipe(recipe_id)
-Lua: eq.enable_recipe(recipe_id), eq.disable_recipe(recipe_id)