New uniform mapping handling

- add optional callback to handle mapping of uniform variables in linking phase
- if no resolver is provided, it uses the internal default resolver with all shifts and auto bind settings

Change-Id: Icfe38a9eabe8bfc8f8bb6d8150c06f7ed38bb762

glslang/MachineIndependent/iomapper.h

@@ -55,7 +55,7 @@ public:
     virtual ~TIoMapper() {}
 
     // grow the reflection stage by stage
-    bool addStage(EShLanguage, TIntermediate&, TInfoSink&);
+    bool addStage(EShLanguage, TIntermediate&, TInfoSink&, TIoMapResolver*);
 };
 
 } // end namespace glslang