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/data/buildcraft/6.2.6/mod-version.cg

@@ -1,7 +1,4 @@
-schema: 2
-name: Buildcraft
-version: 6.2.6
-description: Crafting recipes from BuildCraft, by SpaceToad
+schema: 1
 
 item: Advanced Crafting Table
     recipe:

src/data/buildcraft/mod.cg

@@ -0,0 +1,7 @@
+schema: 1
+
+author:      Spacetoad
+description: A technical mod which adds power generation, mining, and building systems
+url:         http://www.mod-buildcraft.com
+
+version: 6.2.6