Topoeditor suggestions

[tiago-amado]

Hi.
Follows some ideas regarding the new topoeditor update:

• Allow to define the node model (at least for SRL and SROS)
• order alphabetically the kind and Icons dropdowns
• allow to duplicate a node
• there are many hidden features available via shortcuts (e.g. shitf+click or alt+click). is there a way to show the shortcuts available?

Great job! thank you!