Add optional path to PBX variant group

kin/grammar/PBXProj.g4

@@ -315,6 +315,7 @@ pbx_variant_group
         isa_pbx_variant_group
         children
         name
+        path?
         source_tree
       '}' ';'
     ;

kin/grammar/PBXProjLexer.py

@@ -1,4 +1,4 @@
-# Generated from PBXProj.g4 by ANTLR 4.5.2
+# Generated from PBXProj.g4 by ANTLR 4.5.3
 # encoding: utf-8
 from __future__ import print_function
 from antlr4 import *
@@ -931,7 +931,7 @@ class PBXProjLexer(Lexer):
 
     def __init__(self, input=None):
         super(PBXProjLexer, self).__init__(input)
-        self.checkVersion("4.5.2")
+        self.checkVersion("4.5.3")
         self._interp = LexerATNSimulator(self, self.atn, self.decisionsToDFA, PredictionContextCache())
         self._actions = None
         self._predicates = None

kin/grammar/PBXProjListener.py

@@ -1,4 +1,4 @@
-# Generated from PBXProj.g4 by ANTLR 4.5.2
+# Generated from PBXProj.g4 by ANTLR 4.5.3
 from antlr4 import *
 
 # This class defines a complete listener for a parse tree produced by PBXProjParser.