Unite "Edit" and "Wiring" modes

[SimonBuxx]

The goal is to reduce needed button clicks / mouse travel distance.

There are some points to consider, like when should a wire be drawn on drag and when should components be selected / dragged.

Desired behavior:

• Left-click on component / wire selects it
• Dragging components should still work as currently for non-wire components
• Components, including wires, should be selectable by clicking (on mouse up) but dragging over should create a new wire / extend the current wire
• Dragging over empty space creates a wire
• Clicking on an in/output inverts it
• Dragging from an in/output creates a wire

[SimonBuxx]

Selecting would either get its own mode/button or be implemented on right-click.

[SimonBuxx]

As right-click is now used for the pie menu, the feature should be implemented as suggested above, without using right-click.

When implemented, the two mode buttons in the top bar and the top button of the pie menu can be removed.