Added the first draft of the browser window and implemented switching between it and the importer window via menu action.
Also renamed window.py to importer_window and abstracted some features into a superclass from which the browser window can also inherit. This allows an equal interface for them.
Also fixed a bug in the db_adapter.py where an old column name was used for a query.
Added a QTextEdit for art descriptions.
Also added the ability to save and load them from the database. Changing of the description field also triggers a unsaved changes prompt.
Fixed a bug where editing the alias or implication of a tag caused a crash.
Also changed titles that were left unedited from the file name to stay empty inside the database and not be filled with the filename