add support to forward shader for rendering to emission buffer on iOS and implement specular version of forward shader and add soem tests

Assets/ScriptableRenderPipeline/MobileRenderPipeline/ClassicDeferred/Standard.shader

             #pragma multi_compile DIRLIGHTMAP_OFF DIRLIGHTMAP_COMBINED DIRLIGHTMAP_SEPARATE
             #pragma multi_compile DYNAMICLIGHTMAP_OFF DYNAMICLIGHTMAP_ON
             #pragma multi_compile_fog
-            //#pragma multi_compile TILED_FORWARD REGULAR_FORWARD
 
             #pragma vertex vertForward
             #pragma fragment fragForward

Assets/ScriptableRenderPipeline/MobileRenderPipeline/ClassicDeferred/StandardSpecular.shader

 		Tags { "RenderType"="Opaque" "PerformanceChecks"="False" }
 		LOD 300
 	
+		Pass
+        {
+            Name "FORWARD"
+            Tags { "LightMode" = "ForwardSinglePass" }
+
+            Blend [_SrcBlend] [_DstBlend]
+            ZWrite [_ZWrite]
+
+            CGPROGRAM
+            #pragma target 4.5
+
+            // -------------------------------------
+
+            #pragma shader_feature _NORMALMAP
+            #pragma shader_feature _ _ALPHATEST_ON _ALPHABLEND_ON _ALPHAPREMULTIPLY_ON
+            #pragma shader_feature _EMISSION
+            #pragma shader_feature _SPECGLOSSMAP
+            #pragma shader_feature ___ _DETAIL_MULX2
+            #pragma shader_feature _ _SMOOTHNESS_TEXTURE_ALBEDO_CHANNEL_A
+            #pragma shader_feature _ _SPECULARHIGHLIGHTS_OFF
+            #pragma shader_feature _ _GLOSSYREFLECTIONS_OFF
+            #pragma shader_feature _PARALLAXMAP
+
+            #pragma multi_compile LIGHTMAP_OFF LIGHTMAP_ON
+            #pragma multi_compile DIRLIGHTMAP_OFF DIRLIGHTMAP_COMBINED DIRLIGHTMAP_SEPARATE
+            #pragma multi_compile DYNAMICLIGHTMAP_OFF DYNAMICLIGHTMAP_ON
+            #pragma multi_compile_fog
+
+            #pragma vertex vertForward
+            #pragma fragment fragForward
+
+            #include "UnityStandardForwardMobile.cginc"
+
+            ENDCG
+        }
 
 		// ------------------------------------------------------------------
 		//  Base forward pass (directional light, emission, lightmaps, ...)

Assets/ScriptableRenderPipeline/MobileRenderPipeline/ClassicDeferred/UnityStandardForwardMobile.cginc

 #include "UnityStandardConfig.cginc"
 #include "UnityStandardCore.cginc"
 
-#include "ShaderBase.h"
+#include "OnTileShaderBase.h"
 #include "../../fptl/LightDefinitions.cs.hlsl"
 
 #define MAX_SHADOW_LIGHTS 10
 }
 
 // fragment shader main
-                                                
-half4 fragForward(VertexOutputForwardNew i) : SV_Target
+#ifdef UNITY_FRAMEBUFFER_FETCH_AVAILABLE
+	half4 fragForward(VertexOutputForwardNew i) : SV_Target3
+#else
+	half4 fragForward(VertexOutputForwardNew i) : SV_Target
+#endif                                               
 {
 	//float linZ = GetLinearZFromSVPosW(i.pos.w);                 // matching script side where camera space is right handed.
     //float3 vP = GetViewPosFromLinDepth(i.pos.xy, linZ);

Assets/TestScenes/MobileDeferredTest/2DirLightTest/2DirLightTest.unity

   m_SpotAngle: 30
   m_CookieSize: 10
   m_Shadows:
-    m_Type: 1
+    m_Type: 0
     m_Resolution: -1
     m_CustomResolution: -1
     m_Strength: 1
   m_SpotAngle: 30
   m_CookieSize: 10
   m_Shadows:
-    m_Type: 1
+    m_Type: 0
     m_Resolution: -1
     m_CustomResolution: -1
     m_Strength: 1

Assets/TestScenes/MobileDeferredTest/2DirLightTest/op2Dir.mat

   m_PrefabParentObject: {fileID: 0}
   m_PrefabInternal: {fileID: 0}
   m_Name: op2Dir
-  m_Shader: {fileID: 4800000, guid: b262af00aeb504b0a8eba68d77150908, type: 3}
+  m_Shader: {fileID: 4800000, guid: 078f6d0e0964240c28f6acc911996f11, type: 3}
   m_ShaderKeywords: 
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
         m_Texture: {fileID: 0}
         m_Scale: {x: 1, y: 1}
         m_Offset: {x: 0, y: 0}
+    - _SpecGlossMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
     m_Floats:
     - _BumpScale: 1
     - _Cutoff: 0.5
     m_Colors:
     - _Color: {r: 1, g: 1, b: 1, a: 1}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}
+    - _SpecColor: {r: 1, g: 1, b: 1, a: 1}

Assets/TestScenes/MobileDeferredTest/2DirLightTest/trans2Dir.mat

   m_PrefabParentObject: {fileID: 0}
   m_PrefabInternal: {fileID: 0}
   m_Name: trans2Dir
-  m_Shader: {fileID: 4800000, guid: b262af00aeb504b0a8eba68d77150908, type: 3}
+  m_Shader: {fileID: 4800000, guid: 078f6d0e0964240c28f6acc911996f11, type: 3}
   m_ShaderKeywords: _ALPHAPREMULTIPLY_ON
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
         m_Texture: {fileID: 0}
         m_Scale: {x: 1, y: 1}
         m_Offset: {x: 0, y: 0}
+    - _SpecGlossMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
     m_Floats:
     - _BumpScale: 1
     - _Cutoff: 0.5
     m_Colors:
     - _Color: {r: 1, g: 1, b: 1, a: 1}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}
+    - _SpecColor: {r: 1, g: 1, b: 1, a: 1}