Added method for AppUpgrate call to delete AppLevel directory.

MVMCore/MVMCore/OtherHandlers/MVMCoreCache+Extension.swift

@@ -106,4 +106,8 @@ public class CachedData: Codable {
     private func filePath(forKey key: String) -> URL {
         return cacheDirectory.appendingPathComponent("\(key).json")
     }
+    
+    @objc public func removeAllAppLevel() throws {
+        try FileManager.default.removeItem(at: appLevelCacheDirectory)
+    }
 }