Issue 1558: The old preference browser should be as much functionnal as possible while migrating to the new setting system

SLICE-PreferencesMigration-Part6 in InBox
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make the old preference browser fully functional again.
* hacked Preference>>preferenceValue, Preference >>preferenceValue:,
Preference>>rawValue: and Preference>>togglePreferenceValue.
* new Preferences class method category "settings-migration":
For each preference migration, it contains 2 methods for getting and
setting the preference. They are implemented using the new setting system.
As an example for the migration of #annotationPanes:
Preferences class>>annotationPanesSetting and Preferences
class>>annotationPanesSetting: are added.
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Also useful to understand correspondences between old and new preference
systems

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