Add metadata for new gacha assets and implement gacha system scaffolding.

ProjectSettings/PackageManagerSettings.asset

@@ -0,0 +1,42 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!114 &1
+MonoBehaviour:
+  m_ObjectHideFlags: 53
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 0}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 13964, guid: 0000000000000000e000000000000000, type: 0}
+  m_Name: 
+  m_EditorClassIdentifier: UnityEditor.dll::UnityEditor.PackageManager.UI.Internal.PackageManagerProjectSettings
+  m_EnablePreReleasePackages: 0
+  m_AdvancedSettingsExpanded: 1
+  m_ScopedRegistriesSettingsExpanded: 1
+  m_SeeAllPackageVersions: 0
+  m_DismissPreviewPackagesInUse: 0
+  oneTimeWarningShown: 0
+  oneTimePackageErrorsPopUpShown: 0
+  m_Registries:
+  - m_Id: main
+    m_Name: 
+    m_Url: https://packages.unity.com
+    m_Scopes: []
+    m_IsDefault: 1
+    m_Capabilities: 7
+    m_ConfigSource: 0
+    m_Compliance:
+      m_Status: 0
+      m_Violations: []
+  m_UserSelectedRegistryName: 
+  m_UserAddingNewScopedRegistry: 0
+  m_RegistryInfoDraft:
+    m_Modified: 0
+    m_ErrorMessage: 
+    m_UserModificationsEntityId:
+      m_Data: -940
+    m_OriginalEntityId:
+      m_Data: -942
+  m_LoadAssets: 0

ProjectSettings/ProjectSettings.asset

@@ -298,7 +298,10 @@ PlayerSettings:
   m_BuildTargetShaderSettings: []
   m_BuildTargetGraphicsJobs: []
   m_BuildTargetGraphicsJobMode: []
-  m_BuildTargetGraphicsAPIs: []
+  m_BuildTargetGraphicsAPIs:
+  - m_BuildTarget: LinuxStandaloneSupport
+    m_APIs: 1500000011000000
+    m_Automatic: 0
   m_BuildTargetVRSettings: []
   m_DefaultShaderChunkSizeInMB: 16
   m_DefaultShaderChunkCount: 0