Consolidate third-party plugins into Assets/Plugins

Move and consolidate many third-party plugin files and metadata from various locations (notably Assets/Third Parties/Plugins 1 and scattered Opsive/Photon folders) into a unified Assets/Plugins directory. Includes DOTween, PrimeTween, Native/BackroomsNoise, Sirenix/Odin Inspector, and Opsive UltimateCharacterController/shared libs, plus updates to several .meta files and removal of obsolete installer/legacy files. This standardizes plugin layout and cleans up duplicate/obsolete assets.

Assets/Third Parties/Opsive/UltimateCharacterController/Demo/PhysicsMaterials/Character.physicMaterial

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+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!134 &13400000
+PhysicMaterial:
+  m_ObjectHideFlags: 0
+  m_PrefabParentObject: {fileID: 0}
+  m_PrefabInternal: {fileID: 0}
+  m_Name: Character
+  dynamicFriction: 0.2
+  staticFriction: 0
+  bounciness: 0
+  frictionCombine: 1
+  bounceCombine: 1

Assets/Third Parties/Opsive/UltimateCharacterController/Demo/PhysicsMaterials/Character.physicMaterial.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: b202ee37f3bfe31498a60fa2c5a67885
+timeCreated: 1493935287
+licenseType: Pro
+NativeFormatImporter:
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Third Parties/Opsive/UltimateCharacterController/Demo/PhysicsMaterials/Frictionless.physicMaterial

@@ -0,0 +1,13 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!134 &13400000
+PhysicMaterial:
+  m_ObjectHideFlags: 0
+  m_PrefabParentObject: {fileID: 0}
+  m_PrefabInternal: {fileID: 0}
+  m_Name: Frictionless
+  dynamicFriction: 0
+  staticFriction: 0
+  bounciness: 0
+  frictionCombine: 1
+  bounceCombine: 1

Assets/Third Parties/Opsive/UltimateCharacterController/Demo/PhysicsMaterials/Frictionless.physicMaterial.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 55dc46742c445f5489f53610a29708fe
+timeCreated: 1493935287
+licenseType: Pro
+NativeFormatImporter:
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: