Add Pause Menu UI, terrains, and X Bot model

Add a new Pause Menu UI (UXML, USS, TSS, asset/meta) and related UI folder metadata. Add new terrain assets and TerrainData files, plus lighting settings for the 2.5d demo scene. Import a new character model (X Bot.fbx) with its importer meta and new characters folder. Update SampleScene and LFS pointers, and refresh render pipeline settings (Mobile RP & URP global settings) and project/package settings. Tweak multiple material files: align _Color with BaseColor, add SHADOWCASTER to disabled shader passes for Ellen materials, and assign a missing main texture for Vincent_Hero_High_diffuse.

Assets/Game Kit Controller/Pop Up Window Folder.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: ffa9be8063badb445b0c1ab2e827471a
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Game Kit Controller/Scenes/2.5d Demo (8 Way Aim Direction)Settings.lighting

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+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!850595691 &4890085278179872738
+LightingSettings:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_Name: 2.5d Demo (8 Way Aim Direction)Settings
+  serializedVersion: 10
+  m_EnableBakedLightmaps: 1
+  m_EnableRealtimeLightmaps: 1
+  m_RealtimeEnvironmentLighting: 0
+  m_BounceScale: 1
+  m_AlbedoBoost: 1
+  m_IndirectOutputScale: 1
+  m_UsingShadowmask: 1
+  m_BakeBackend: 1
+  m_LightmapMaxSize: 1024
+  m_LightmapSizeFixed: 0
+  m_UseMipmapLimits: 1
+  m_BakeResolution: 40
+  m_Padding: 2
+  m_LightmapCompression: 3
+  m_LightmapPackingMode: 1
+  m_LightmapPackingMethod: 0
+  m_XAtlasPackingAttempts: 16384
+  m_XAtlasBruteForce: 0
+  m_XAtlasBlockAlign: 0
+  m_XAtlasRepackUnderutilizedLightmaps: 1
+  m_AO: 0
+  m_AOMaxDistance: 1
+  m_CompAOExponent: 1
+  m_CompAOExponentDirect: 0
+  m_ExtractAO: 0
+  m_MixedBakeMode: 2
+  m_LightmapsBakeMode: 1
+  m_FilterMode: 1
+  m_LightmapParameters: {fileID: 15204, guid: 0000000000000000f000000000000000, type: 0}
+  m_ExportTrainingData: 0
+  m_EnableWorkerProcessBaking: 1
+  m_TrainingDataDestination: TrainingData
+  m_RealtimeResolution: 2
+  m_ForceWhiteAlbedo: 0
+  m_ForceUpdates: 0
+  m_PVRCulling: 1
+  m_PVRSampling: 1
+  m_PVRDirectSampleCount: 32
+  m_PVRSampleCount: 512
+  m_PVREnvironmentSampleCount: 512
+  m_PVREnvironmentReferencePointCount: 2048
+  m_LightProbeSampleCountMultiplier: 4
+  m_PVRBounces: 2
+  m_PVRMinBounces: 2
+  m_PVREnvironmentImportanceSampling: 0
+  m_PVRFilteringMode: 2
+  m_PVRDenoiserTypeDirect: 0
+  m_PVRDenoiserTypeIndirect: 0
+  m_PVRDenoiserTypeAO: 0
+  m_PVRFilterTypeDirect: 0
+  m_PVRFilterTypeIndirect: 0
+  m_PVRFilterTypeAO: 0
+  m_PVRFilteringGaussRadiusDirect: 1
+  m_PVRFilteringGaussRadiusIndirect: 5
+  m_PVRFilteringGaussRadiusAO: 2
+  m_PVRFilteringAtrousPositionSigmaDirect: 0.5
+  m_PVRFilteringAtrousPositionSigmaIndirect: 2
+  m_PVRFilteringAtrousPositionSigmaAO: 1
+  m_RespectSceneVisibilityWhenBakingGI: 0

Assets/Game Kit Controller/Scenes/2.5d Demo (8 Way Aim Direction)Settings.lighting.meta

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+fileFormatVersion: 2
+guid: fb3b36f7f361e6146bcbfbe897f58955
+NativeFormatImporter:
+  externalObjects: {}
+  mainObjectFileID: 4890085278179872738
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: