Refactor Database and Database widgets (#2491)

The Database, DatabaseWidget, and DatabaseTabWidget classes share many responsibilities in inconsistent ways resulting in impenetrable and unmaintainable code and a diverse set of bugs and architecture restrictions. This patch reworks the architecture, responsibilities of, and dependencies between these classes.

The core changes are:

* Move loading and saving logic from widgets into the Database class
* Get rid of the DatabaseManagerStruct and move all the information contained in it into the Database
* Let database objects keep track of modifications and dirty/clean state instead of handing this to external widgets
* Move GUI interactions for loading and saving from the DatabaseTabWidget into the DatabaseWidget (resolves #2494 as a side-effect)
* Heavily clean up DatabaseTabWidget and degrade it to a slightly glorified QTabWidget
* Use QSharedPointers for all Database objects
* Remove the modifiedImmediate signal and replace it with a markAsModified() method
* Implement proper tabName() method instead of reading back titles from GUI widgets (resolves #1389 and its duplicates #2146 #855)
* Fix unwanted AES-KDF downgrade if database uses Argon2 and has CustomData
* Improve code

This patch is also the first major step towards solving issues #476 and #2322.

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/TestDeletedObjects.h b/tests/TestDeletedObjects.h
index d96452093..61d864a67 100644
--- a/tests/TestDeletedObjects.h
+++ b/tests/TestDeletedObjects.h
@@ -27,7 +27,7 @@ class TestDeletedObjects : public QObject
     Q_OBJECT
 
 private:
-    void createAndDelete(Database* db, int delObjectsSize);
+    void createAndDelete(QSharedPointer<Database> db, int delObjectsSize);
 
 private slots:
     void initTestCase();