[dev] UI initialisation using component bootstrap mechanism

Dear developers,

As informed at yesterday's JF, we (Richard Klees and I) kindly ask you to have a final look into the PR which moves the initialisation of the UI framework to the new component bootstrap mechanism ( https://github.com/ILIAS-eLearning/ILIAS/pull/7969).

The most important changes, besides the UI framework, are inside the Init-Service, with some small changes along other components.

If there are no objections made directly in the PR, we will merge it next week.

Kind regards, -- *Thibeau Fuhrer* Professional Software Developer

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