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Add an Import option to close imported projects after import to avoid
unwanted build activities in large projects. Imported projects are open
during the import due to copying of resources or project configurators.
Added option for the 'old' WizardProjectsImportPage and the 'new'
SmartImportWizard.

Change-Id: I76fd257cacd212bd62627051953ce74c169ce2a8
Signed-off-by: Conrad Groth <info@conrad-groth.de>