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)