Add node selection explorer #5
Description
Expected behaviour:
- Beside the flow viewer should be a node selection menu of all loaded nodes that is searchable.
- Shortcut menu is split viewed with inspector view
- When a user clicks on a node in the node selection menu it should attach to the mouse in the flow view and when the user clicks again in the flow view it will "drop" it.
Actual behaviour:
- Only inspector view is shown. Makes it impossible for new users to know that they must right click to know which nodes exist.
- Existing shortcut menu places the node immediately on clicking.