refactoring, add participants to sequence diagram, resolves #47 #48
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Refactored into 3 files.
Improved diagram type checker that activates correct handlers.
First handler for sequence backgrounds that gets x coordinates of the click relative to the svg.
Next:
Fix so that if we change to another diagram type the handlers for the old one are deactivated
Create a model for keeping track of participants and their coordinates.
Create "addParticipant" endpoint that adds a participant at the correct position