JBIDE-17084 Provide method to run Palette wizards without UI

Type for result of running wizard is created.
Checkbox field editor is modified to be run without UI.
JBIDE-17101 Avoid creating wizard widgets at dnd with Ctrl pressed

Interface IDropWizardExtension is added.
DefaultDropCommand.execute(DropData) is modified by option to
run wizard without dialog.
JBIDE-16687 provide access to palette entries via content assist

Proposals filtering is skipped for the ones that come from Palette
JBIDE-17080 Clipboard operations doesn't work in Properties editor

Added missing functionality to DialogCellEditorEx
JBIDE-17165 jQuery Mobile Palette 1.3 still have HTML 5 items

Do not save Mobile palette which is read-only with
editable JSF palette. When saved it keeps items that
might be removed in new versions of JBoss Tools.
JBIDE-17148 api enhancement for url transport utility class