[Eddykasp]

This synthesis hook adds a very basic configuration of top-down layout for SCCharts.
depends on eclipse-elk/elk#1089

• check that the hook works for the currently released versions of KLighD and ELK
• add descriptions for the the synthesis options using .setDescription once final set of desired options has been decided
• should add some way to hide this option in the eclipse Kieler since it can't handle top-down rendering

[NiklasRentzCAU]

If it also works with the last ELK/KLighD releases, I'd be happy to have it in the semantics master! Alex would need to review first before merging, though.

[Eddykasp]

I've updated the configuration to use the new dynamic size categories with a sensible selection of default config values and a minimal set of exposed synthesis options.