Add first stage of a new single-file parser

This first stage consists of the general framework for the parser as
a whole, a lexical analyzers to converts text into commands, and the
semantic anlyzer to convert commands into a complete data structure
representing the cumulative effect of running the commands.

src/client/models/parsing-2/parser_extensions/item_pe_v1.coffee

@@ -0,0 +1,40 @@
+#
+# Crafting Guide - item_pe_v1.coffee
+#
+# Copyright © 2014-2016 by Redwood Labs
+# All rights reserved.
+#
+
+ParserExtension = require '../parser_extension'
+
+########################################################################################################################
+
+module.exports = class ItemParserExtensionV1 extends ParserExtension
+
+    # Command Methods ##############################################################################
+
+    _command_gatherable: (command)->
+        return if @missingArgText command
+
+        return if @missingCurrent command, 'item'
+
+        item = @state.getCurrent 'item'
+        return if @duplicateField command, 'gatherable', item
+
+        gatherable = @parseBoolean command, command.argText
+        return unless gatherable?
+
+        item.gatherable = gatherable
+
+    _command_item: (command)->
+        return if @missingArgText command
+        return if @missingCurrent command, 'modVersion'
+        return if @alreadyExists command, 'item', command.argText
+
+        item = @state.create command, 'item', command.argText
+        item.name = command.argText
+
+        group = @state.getCurrent 'itemGroup'
+        if group? then item.group = group
+
+        item.modVersion = @state.getCurrent 'modVersion'