Summary of feature request description

* actual behaviour:

Since introduction of the new MainApp there was a lack of storing preferences persistently. This is important
for most modules due to the need of having the possibility to store some user-adjustable default values.

* expected behaviour

The expected behaviour is split up in two parts:

Part 1: The GUI-independent part should offer an application-wide interface to put and receive preferences
Part 2: The GUI-dependent part: Their must be an exposed possibility to edit preferences through the GUI 

Cause of the bug

-

Proposed solution

For part 1: Implement the PreferencesStore Interface (in org.opencherry.core.runtime) published by the OSGi-Group in "OSGi Service Platform Release 4 Version 4.1 Compendium Specification"
For part 2: Create a preferences dialog in org.mitk.gui.qt.application. This preferences dialog can be dynamically extended by "Preference pages". This can be done by
	implementing the IPreferencePage-Interface on the extension point "org.opencherry.ui.preferencePages".


Affected bundles
	org.mitk.gui.qt.application
		Edited classes:
			- QmitkWorkbenchWindowAdvisor
			- QmitkWorkbenchWindowAdvisorHack
		Added classes:
			- QmitkGeneralPreferencePage
			- QmitkPreferencesDialog

	(***not in core but connected to the classes mentioned above***)

	org.opencherry.core.runtime
		Added classes:
			cherryBackingStoreException
			cherryICherryPreferences
			cherryICherryPreferencesService
			cherryIPreferences
			cherryIPreferencesService
			cherryAbstractPreferencesStorage
			cherryPreferences
			cherryPreferencesService
			cherryXMLPreferencesStorage

	org.opencherry.ui
		Changed plugin.xml (added extension points "preferencePages" and "keywords")
		Added: IPreferencePage

	org.opencherry.ui.qt
		Added: IQtPreferencePage

How will the bugfix get tested?

- For the GUI-independent part there is a new openCherry test bundle "Testing/org.opencherry.core.runtime"
- For the GUI-dependent part there will be application testing once there is a solution