Ms2/modeler selection export

[jjoderis]

Summary

Related to: #144

Improved the export handling when exporting from the modeler by adding support for partial export only of selected elements (and elements nested inside them) and by considering which layer of the process is open when the export is triggered

Also added a config for debugging the frontend of the new MS in vscode

Details

• Fixed: lanes cannot be found by our bpmn helper functions
• Fixed: running getElementDI on a diagram that has an empty layer leads to an error
• if a user has elements in the modeler selected opens the export modal and selects an image type for the export an option to export only the selection is given
  • exporting only the selection will remove the visualization of all elements that are not selected and also not nested inside a selected element
  • imports that are used by call activities outside the selection are also excluded from the export
  • the layers of subprocesses outside the selection are also excluded from the export
• if the layer of a collapsed subprocess is open in the modeler when the export modal is opened that layer is considered the root of the export when an image export is selected
  • all layers not nested under the current layer are not exported (including the layer of the root process)
  • imports and subprocesses inside layers that are not exported are also not exported
• imports used by call-activities inside nested collapsed subprocesses are no longer exported when the collapsed subprocesses themselves are not exported

[OhKai]

fyi, you can achieve the same by ArrayType[number]