* 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
* Turned QtProjectWizzard into window for Source Group ui
* Clicking into FilePicker when empty will open dialog right away
* Fixed environment variable use throughout all Source Group path values
* Moved Preferences to QtPreferencesWindow
bug id = 230
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* 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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malte_langkabel