Exported prior reviews from Gerrit Code Review
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* Allow dynamic change of a text cell editor's proposal provider.
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* Allow multiline text cell editors.
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* Fixed positioning of proposal popup for multiline texts.
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* Use CTRL+SPACE for content assistant in RAP.
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* Fixed behaviour of multiline cell editor in RAP.
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* Removed unused code for content proposals.
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* Fixed behavior of text cell editor under RAP.
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* Restructure text cell editor.
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* Fixed content proposals for RAP.
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* Fixed ID of URIEditorInputFactory.
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* Improved marker support.
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* added license information
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* updated license information
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* Fixed assignments in constructor.