Bring the savegame_lib to the same level as the SoG-Savegame-Editor

[tolik518]

In the SoG-Savegame-Editor every data from the savegame was extracted, and saved.
While we don't need all of those features in the character editor, we certainly could use them in the savegame_lib to use for other projects.

To implement those feature one could look up here:

• SoG_SGreader/DataReader.cs
• SoG_SGreader/DataWriter.cs
• SoG_SGreader/Enums