revise jobuidelegate factorization

• JobUiDelegateFactoryV2 is now extending JobUiDelegateFactor with a createDelegate that can take a QWidget and flag arguments. this is in particular to allow us to force creation of delegates to go through the factory and not ever need to be done directly. this then allows plasma-integration to supply a different factory and selectively override delegation with more plasma-esque UIs
• JobUiDelegate existing constructors are deprecated
• new protected JobUiDelegate constructors taking a dummy argument to differentiate them from the deprecated variants (they are protected such that they aren't called directly anymore - creation must happen through the factory!)
• all existing of direct construction have been ported to factorization where the direct construction was not actually required

(draft because deprecations aren't properly done yet)