#598 - InternalDatabase is no longer used for json serialization

src/main/java/de/deadlocker8/budgetmaster/database/InternalDatabase.java

 package de.deadlocker8.budgetmaster.database;
 
-import com.google.gson.annotations.Expose;
 import de.deadlocker8.budgetmaster.accounts.Account;
 import de.deadlocker8.budgetmaster.accounts.AccountType;
 import de.deadlocker8.budgetmaster.categories.Category;
@@ -17,28 +16,11 @@ import java.util.stream.Collectors;
 
 public class InternalDatabase
 {
-	@Expose
-	private final String TYPE = "BUDGETMASTER_DATABASE";
-
-	@Expose
-	private final int VERSION = 5;
-
-	@Expose
 	private List<Category> categories;
-
-	@Expose
 	private List<Account> accounts;
-
-	@Expose
 	private List<Transaction> transactions;
-
-	@Expose
 	private List<Template> templates;
-
-	@Expose
 	private List<Chart> charts;
-
-	@Expose
 	private List<Image> images;
 
 	public InternalDatabase()