Display annotation forms in left pane

[lars-reimann]

Instead of using modal dialogs for annotation forms they could replace the tree view in the left pane. This would give us more space to work with and the details view on the right could still be scrolled.

Tasks:

• Manage the visibility of the form in the app component or Redux rather than in each parameter node. Could be an object { type: "rename", target: someDeclaration }.
• Use autofocus to focus the first input field/dropdown/etc.