fixed non existing project open
checking if project and branch really exists in case of changes...
basic project seed have been updated to addOns
now addOns can be changed on the run
now add-on can be freely started and stopped with the registry...
add-on smoke tested and ready to merge
Merge branch 'master' of https://github.com/webgme/webgme into snap
update_project now takes care of the usedAddOns registry key
Merge branch 'master' of https://github.com/webgme/webgme into snap
Added required functions to override
Updated svgs
Added displayAllConnectionAreas
Minor changes