Add camo sliders to the paint HUD and tune the player

Add the HalfLambert, HalfLambert brightness and specular-damp sliders to the paint HUD panel, dial the camo values on Player.mat, and disable shadow casting on the Paintman renderer so the player's cast shadow no longer gives away its position.

Assets/Materials/Player.mat

@@ -11,7 +11,8 @@ Material:
   m_Shader: {fileID: 4800000, guid: 7b3dd5720b6152047b45788060d64904, type: 3}
   m_Parent: {fileID: 0}
   m_ModifiedSerializedProperties: 0
-  m_ValidKeywords: []
+  m_ValidKeywords:
+  - _FORMSOFTNESSMODE_UNIFORM
   m_InvalidKeywords: []
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
@@ -97,7 +98,8 @@ Material:
     - _DstBlend: 0
     - _DstBlendAlpha: 0
     - _EnvironmentReflections: 1
-    - _FormSoftness: 0.4
+    - _FormSoftness: 0.5
+    - _FormSoftnessUniform: 1
     - _GlossMapScale: 0
     - _Glossiness: 0
     - _GlossyReflections: 0