Use str_number_variable to define paths (#116)

For simplicity, Kin also accepts variables in path entries.
However, I don't feel this is such a big change and, at worst, this
would simply show false negatives on synthetic config files where
variables are used (maybe they are even valid, I didn't test it).

kin/grammar/PBXProj.g4

@@ -683,7 +683,7 @@ name
     ;
 
 path
-    : PATH '=' any_string ';'
+    : PATH '=' str_number_variable ';'
     ;
 
 source_tree

kin/grammar/PBXProjParser.py

@@ -537,7 +537,7 @@ def serializedATN():
         1350,5,68,0,0,1350,1351,5,3,0,0,1351,1352,3,224,112,0,1352,1353,
         5,4,0,0,1353,211,1,0,0,0,1354,1355,5,69,0,0,1355,1356,5,3,0,0,1356,
         1357,3,382,191,0,1357,1358,5,4,0,0,1358,213,1,0,0,0,1359,1360,5,
-        70,0,0,1360,1361,5,3,0,0,1361,1362,3,382,191,0,1362,1363,5,4,0,0,
+        70,0,0,1360,1361,5,3,0,0,1361,1362,3,384,192,0,1362,1363,5,4,0,0,
         1363,215,1,0,0,0,1364,1365,5,71,0,0,1365,1366,5,3,0,0,1366,1367,
         3,382,191,0,1367,1368,5,4,0,0,1368,217,1,0,0,0,1369,1370,5,72,0,
         0,1370,1371,5,3,0,0,1371,1372,5,13,0,0,1372,1373,5,4,0,0,1373,219,
@@ -8678,8 +8678,8 @@ def __init__(self, parser, parent:ParserRuleContext=None, invokingState:int=-1):
         def PATH(self):
             return self.getToken(PBXProjParser.PATH, 0)
 
-        def any_string(self):
-            return self.getTypedRuleContext(PBXProjParser.Any_stringContext,0)
+        def str_number_variable(self):
+            return self.getTypedRuleContext(PBXProjParser.Str_number_variableContext,0)
 
 
         def getRuleIndex(self):
@@ -8707,7 +8707,7 @@ def path(self):
             self.state = 1360
             self.match(PBXProjParser.T__2)
             self.state = 1361
-            self.any_string()
+            self.str_number_variable()
             self.state = 1362
             self.match(PBXProjParser.T__3)
         except RecognitionException as re:

tests/ok/019.pbxproj

@@ -0,0 +1,15 @@
+{
+	archiveVersion = 1;
+	classes = {};
+	objectVersion = 46;
+	objects = {
+		FE870E28DC2371E7ACA886F03F460581 = {isa = PBXFileReference; explicitFileType = text.xcconfig; name = "Something.xcconfig"; path = 0840; sourceTree = "<group>"; wrapsLines = 1; };
+		78452DDA02BFEF5D6BA29AEFB4B1266A = {isa = PBXGroup; children = (FE870E28DC2371E7ACA886F03F460581,); name = Configurations; sourceTree = "<group>"; };
+		49FBBF861C10C2A200A1A4BB = {isa = PBXProject; buildConfigurationList = 49FBBF891C10C2A200A1A4BB; compatibilityVersion = "Xcode 3.2"; hasScannedForEncodings = 0; mainGroup = 49FBBF851C10C2A200A1A4BB; productRefGroup = 49FBBF8F1C10C2A200A1A4BB; projectDirPath = ""; projectRoot = ""; targets = (49FBBF8D1C10C2A200A1A4BB, 4973659B1C19BC6E00837617,); };
+		49FBBF951C10C2A200A1A4BB = {isa = PBXVariantGroup; children = (49FBBF961C10C2A200A1A4BB,); name = Main.storyboard; sourceTree = "<group>"; };
+		49FBBF9A1C10C2A200A1A4BB = {isa = PBXVariantGroup; children = (49FBBF9B1C10C2A200A1A4BB,); name = LaunchScreen.storyboard; sourceTree = "<group>"; };
+		497365A41C19BC6E00837617 = {isa = XCBuildConfiguration; baseConfigurationReference = 274E42B0193BA6FEFA8FD71C; buildSettings = { FRAMEWORK_SEARCH_PATHS = ("$(inherited)", "$(PROJECT_DIR)/build/Debug-iphoneos",); }; name = Debug; };
+		49FBBFB61C10C2A200A1A4BB = {isa = XCConfigurationList; buildConfigurations = (49FBBFB71C10C2A200A1A4BB, 49FBBFB81C10C2A200A1A4BB,); defaultConfigurationIsVisible = 0; defaultConfigurationName = Release; };
+	};
+	rootObject = 49FBBF861C10C2A200A1A4BB;
+}