A more context-sensitive right-click menu

Migrated from https://bugs.launchpad.net/inkscape/+bug/170648 🍷

The Idea:

It would be very useful if the right-click menu options were sensitive to whatever object was selected on the left-hand toolbar. What I mean is, apart from the basic cut, copy, paste tools, have the options change to reflect whatever tool you're using at the time.

Examples:

If you're using the select and transform tool:

• Rotate 90 degrees counter-clockwise
• Rotate 90 degrees clockwise
• Flip section horizontally
• Flip section vertically
• Lower selection to bottom
• Lower selection one step
• Raise selection one step
• Raise selection to top

If you're using the node editor:

• Insert new node
• Delete selected node
• Join paths at selected nodes
• Join paths at selected nodes with new segment
• Split path between two non-endpoint nodes
• Break path at selected nodes
• Make nodes corner
• Make nodes smooth
• Make nodes symmetric
• Make segment line
• Make segment curve
• Convert objects to paths
• Convert strokes to paths

If Zoom is selected:

• Zoom in
• Zoom out
• Fit selection in window
• Fit drawing in window
• Fit page in window
• Fit page width in window

... you get the idea.