* also changed xml elements in sourcegroup settings that specify the used language standard, so that one sourcegroup can maintain multiple language standards
* added migration and migrated sample projects
* fixed error columns are not saved to database correctly
* implemented setting JRE System Library paths in app settings
* added detector for JRE System Library that not use Java Runtime specified in AppSettings but detects JRE on its own by reusing the JavaPathDetector.
* added option to use JRE System Library in JavaSourceGroup
* NameHierarchy now looks like this: <delimiter>\tm<all the rest>
* made new baseclasses for SettingsMigration and SettingsMigrator
* Use the migration system for SqliteBookmarkStorage as well
* project can not have multiple source groups with different types
* language of a project is now inferred from source groups
* setting global NameHierarchy delimiter of first sourceGroup in project
* added project settings migrations for source groups
* Add Settings Migration classes (MoveKey, DeleteKey, Lambda)
* Update sample projects with migrations
* added method to config to retrieve sublevel key names
* implemented recursive removing of keys in settings
* moved project files out of top level
* removed solution parsing code as it is not used anymore
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* moved sample projects from data to user folder
* added fallback files for app and window settings
* implemented copying app and window settings to user folder when not found on app startup
* fixed upgrading for windows installer