Support multiple layout algorithms for flowcharts

[knsv]

Currently the layout mechanism mermaid is using is a dagre algorithm. It would be powerfull to add the possibility to specify which layout algoritm to use.

An organic layout should also be supported.
The organic layout above uses a predefined force-directed graph layout

% Current syntax
graph TD
...
end

% Specifices the diffrent layout algorithm
graph Organic
....
end

To address scenarios with subgraphs, the following approach could be used. This would be nice to have though is it might be quite complex.

graph Organic
subgraph Hierarchical TD
...
end
subgraph Hierarchical LR
...
end
end

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