✨ Adding date of next theory phase start to home screen

- Also some UI stuff, documentation and removal of unused CoreData entities

DHBW-Service/Utility/UtilityFunctions.swift

@@ -45,7 +45,7 @@ class UtilityFunctions {
     }
     
     public class func deleteAllData() -> Bool {
-        let entities = ["User", "Item"]
+        let entities = ["User", "RaPlaEvent"]
         var allSuccessful = true
         
         for entityName in entities {