Massive refactoring to clean up models

* Tweak style of quantity label in output box to be more visible
* Move data files for all mods under a directory for the specific
  version of the mod
* Add a `silent` property to the base model to prevent models which
  shouldn't be observed from emitting events
* Change the term "itemSlug" to just "slug" across the board
* Change all models so that they don't require their parent in their
  constructors and so that they don't automatically add themselves to
  their parents lists
* Remove a bunch of unnecessary event triggering
* Tighten up access to various lists of children across all models
* Refactor the guts of the V2 parser into an abstract base class so
  it can be used for other parsers in the future
* Remove a number of unused methods

src/scripts/models/crafting_table.coffee

@@ -81,7 +81,7 @@ module.exports = class CraftingTable extends BaseModel
     getToolNames: ->
         recipe = @plan.steps[@_step]?.recipe
         return '' unless recipe?
-        toolSlugs = (stack.itemSlug for stack in recipe.tools)
+        toolSlugs = (stack.slug for stack in recipe.tools)
         toolNames = (@modPack.findName(slug) for slug in toolSlugs).join ', '
         return toolNames