Link styles and node links

[biscofil]

Nodes can have links.
Links can now have individual styles.

The old "style" attribute of Link has been renamed to "type" as in the official documentation https://mermaid-js.github.io/mermaid/#/flowchart?id=links-between-nodes .

The style can be added though a parameter of the constructor.

Example:

$subGraph1
    ->addNode($nodeA = new Node('A', 'AAAA', Node::SQUARE, "https://mermaid-js.github.io/"))
    ->addNode($nodeB = new Node('B', 'BBBB', Node::ROUND))
    ->addLink(new Link($nodeA, $nodeB, 'A dec char:♥', Link::ARROW, 'stroke:blue,stroke-width:4px'));

Result:

[SmetDenis]

Hi @biscofil

Thank you very much for your PR. Your change looks helpful.

Unfortunately, I see two issues.

• The tests didn't pass.
• You have a lot of changes that are not relevant to the fix (spaces).

Can you leave only the changes that are relevant to your fix and check changes via GH Actions?

Thank you!

[sonarcloud]

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