Refactor ModVersion into Mod and ModVersion

* Remove V1 of the mod version parser and shift V2 up to be V1
* Add a parser for mod.cg files, and refactor the the mod-version.cg
  files to push the appropriate content up to the mod.cg
* Remove the concept of "silent" from BaseModel along with logging
  each event as they are fired (which is what really prompted the
  need for it in the first place)
* Move use of the Storage class to be completely the province of the
  controllers most closely related to models affected
* Convert the ModVersionController to the ModController and have it
  take on responsibility for choosing the mod version
* Update BaseModel to support simple accessors for the current state
* Update CraftingPlan to be able to remove uncraftable items
* Implement the Mod model

src/scripts/models/crafting_plan.coffee

@@ -23,29 +23,26 @@ module.exports = class CraftingPlan extends BaseModel
         @need   = new Inventory
         @result = new Inventory
 
-        @clear silent:true
+        @clear()
 
         @have.on    Event.change, => @craft()
         @want.on    Event.change, => @craft()
-        @modPack.on Event.add, => @craft()
+        @modPack.on Event.change, => @craft()
 
         @on Event.change + ':includingTools', => @craft()
 
     # Public Methods ###############################################################################
 
     clear: (options={})->
-        options.silent ?= false
-
         @steps = []
         @need.clear()
         @result.clear()
 
-        @trigger 'change', this unless options.silent
+        @trigger 'change', this
         return this
 
     craft: ->
-        @clear silent:true
-        @need.silent = @result.silent = true
+        @clear()
 
         @result.addInventory @have
 
@@ -59,11 +56,19 @@ module.exports = class CraftingPlan extends BaseModel
         @_removeExtraSteps()
         @result.addInventory @want
 
-        @need.silent = @result.silent = false
         @need.trigger 'change', @need
         @result.trigger 'change', @result
         @trigger 'change', this
 
+    removeUncraftableItems: ->
+        toRemove = []
+        @want.each (stack)=>
+            item = @modPack.findItem stack.slug
+            if not item? then toRemove.push stack.slug
+
+        for slug in toRemove
+            @want.remove slug
+
     # Event Methods ################################################################################
 
     onIncludingToolsChanged: ->