Added SymbolTypeAtCaretConditionEvaluator.
Added some code editor context menus dependent on symbol at caret (like "Rename", "Find references" etc.)
Separate AddInTree paths for context menus of different symbol types with inclusion of EntityContextMenu, where sensible.
Added "Goto Definition" command to symbol context menus.
Added DeclaringTypeSubMenuBuilder.
Completed "Declaring type: ..." context menu basically, but currently no translated name and no proper icon.
Simplified symbol context menu, now the menu entries are included directly inside of EntityContextMenu.
Merge remote-tracking branch 'remotes/origin/master' into refactoringFeatures