ref #7268, #6913 Remove p2 related code

Fix class cast exception in SaveHandler

Do not expand whole preferences tree initially

Fix state handling of save button/dirty flag for indirect edits(details)

ref #6429: adapt admin preferences to other preferences

ref #7268 Refactored p2 update related classes

• moved handle and util to store plugin
• re-wrote update handler to not relate on eclipse internal update site preferences

ref #7268 Sort root nodes in preference dialog

ref #7268 Fix stateful behavior of OpenPreferenceHandler

• Convert class variables to local variables

ref #7268 Fix hierarchy of preference nodes

ref #7268 Implement own extension point for preferences

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eu.etaxonomy.taxeditor.workbench/fragment.e4xmi¶