Renderer vs Node-RED fidelity improvements

[Steve-Mcl]

Description

General rendering improvements including:

• More accurate in/out port rendering
• core tcp and udp nodes now rendered
• Use topic for label when no other label defined (core nodes) Many nodes now get more accurate labels
• icon positioning correction
• grid snapping to improve #20
• fixes bugs related to original flow object being mutated (original flows were not cloned)

BEFORE

AFTER

Related Issue(s)

20

Checklist

• [x] I have read the contribution guidelines
• [ ] Suitable unit/system level tests have been added and they pass
• [ ] Documentation has been updated
  • [ ] Upgrade instructions
  • [ ] Configuration details
  • [ ] Concepts
• [ ] Changes flowforge.yml?
  • [ ] Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • [ ] Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production

Labels

• [ ] Backport needed? -> add the backport label
• [ ] Includes a DB migration? -> add the area:migration label