Created the note sustain shader and implemented it (#210)

* Created the sustain shader and implemented it

* Made the primary line thinner

* Minor adjustments to amplitude

Assets/Art/Materials/PlayMode/Sustain.mat

@@ -8,20 +8,16 @@ Material:
   m_PrefabInstance: {fileID: 0}
   m_PrefabAsset: {fileID: 0}
   m_Name: Sustain
-  m_Shader: {fileID: 4800000, guid: 933532a4fcc9baf4fa0491de14d08ed7, type: 3}
-  m_ValidKeywords:
-  - _EMISSION
-  - _SURFACE_TYPE_TRANSPARENT
+  m_Shader: {fileID: -6465566751694194690, guid: 03960ab34a3039445b3bfa8743305b5f,
+    type: 3}
+  m_ValidKeywords: []
   m_InvalidKeywords: []
   m_LightmapFlags: 2
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
   m_CustomRenderQueue: 2999
-  stringTagMap:
-    RenderType: Transparent
-  disabledShaderPasses:
-  - DepthOnly
-  - SHADOWCASTER
+  stringTagMap: {}
+  disabledShaderPasses: []
   m_SavedProperties:
     serializedVersion: 3
     m_TexEnvs:
@@ -69,6 +65,10 @@ Material:
         m_Texture: {fileID: 0}
         m_Scale: {x: 1, y: 1}
         m_Offset: {x: 0, y: 0}
+    - _ThinTexture:
+        m_Texture: {fileID: 2800000, guid: 342e33d746f923d49819aa62c4aa3534, type: 3}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
     - unity_Lightmaps:
         m_Texture: {fileID: 0}
         m_Scale: {x: 1, y: 1}
@@ -85,6 +85,7 @@ Material:
     m_Floats:
     - _AlphaClip: 0
     - _AlphaToMask: 0
+    - _Amplitude: 0
     - _Blend: 0
     - _BlendModePreserveSpecular: 0
     - _BumpScale: 1
@@ -96,15 +97,23 @@ Material:
     - _DetailNormalMapScale: 1
     - _DstBlend: 10
     - _DstBlendAlpha: 10
+    - _EmissionStrength: 1
     - _EnvironmentReflections: 1
+    - _ForwardOffset: 0
+    - _Frequency: 5
     - _GlossMapScale: 0
     - _Glossiness: 0
     - _GlossyReflections: 0
     - _Metallic: 0
     - _OcclusionStrength: 1
     - _Parallax: 0.005
+    - _PrimaryAmplitude: 1
+    - _PrimaryFrequency: 10
+    - _QueueControl: 0
     - _QueueOffset: -1
     - _ReceiveShadows: 1
+    - _SecondaryAmplitude: 1
+    - _SecondaryFrequency: 10
     - _Smoothness: 0
     - _SmoothnessTextureChannel: 0
     - _SpecularHighlights: 1