[JBIDE-14744] allow users to choose quickstarts
[JBIDE-14744] allow applications to get created via ICartridge

Since quickstarts wont specify whether a required cartridge is
standalone (web-) or embeddable (add-on), we have to make sure we're
relying on ICartridge only (dropping IEmbeddableCartridge and
IStandalone where required).
[JBIDE-14744] allow users to choose quickstarts in application wizard
[JBIDE-14744] implementing Editing for quickstart cartridges