DatabaseTableEditor constructor Null safety

1. irte_engine
2. database_storage
3. DatabaseTableEditor
4. DatabaseTableEditor constructor

DatabaseTableEditor mixin

1. Constructors
2. DatabaseTableEditor
3. Properties
4. db
5. hashCode
6. name
7. runtimeType
8. schema
9. tableNames
10. version
11. Methods
12. addColumn
13. addTable
14. deleteTable
15. ensureDbOpen
16. getItems
17. loadTableSchema
18. noSuchMethod
19. toString
20. updateTableSchema
21. Operators
22. operator ==