Release v0.7.1 — ELK layout for Mermaid diagrams

Flowcharts can now be arranged by the ELK layout engine, which keeps arrows from crossing and stacking on top of each other.

Features

• Arrange any flowchart with the ELK engine by adding layout: elk at the top of the diagram; dense architecture diagrams keep straighter lanes and far fewer overlapping arrows (#138)
• Insert a ready-made ELK flowchart from the quick template buttons above the diagram editor, or from the full template list (#138)