Grid: refactored, so it uses new multiple SelectBoxEditor

With this change we have less properties in UI Inspector, as now it's possible to select e.g. column size for different devices in single select box editor.
Custom ContentCollectionImplementation removed as not necessary anymore

Setting default node properties, where needed, should be done in more fashionable way, using events/signals when node is created.
FontIcon: re-factored, uses multiple SelectBoxEditor
magellanSupport, fragmentId: support for few more node types (Headline, Menu) + cosmetic improvements
Aloha: formatting options improved
UI Inspector: tabs defined, groups/properties reorganised