test(UI-TEST/cockpit): Add action bar tests

check button visibility on defintionand instance view
style(UI-TEST/admin): amend coding style

replace " with ' due to wrong template
fix(README): remove commons-ui from auto-build enabled

The camunda-commons-ui repository is only aimed
to provide libraries or utilities for the other UI aspects
of the webapps, it does not have to be build.

Related to: 
https://groups.google.com/d/msg/camunda-bpm-dev/Ctmc3sQSfxc/xkTrM1tWQ4EJ
fix(demoData): serialize potential approvers as JSON
Merge branch 'master' of github.com:camunda/camunda-bpm-webapp
chore(npm): use camunda nexus to proxy npm registry

related to #CAM-2971
chore(example): provide a further process with task without a name
fix(UI-TEST/tasklist): amend tests to new layout

amend tests due to refactoring #CAM-2779
chore(pa-invoice): add checkboxes to invoice pa
chore(rest): update class name used in JAX-RS application

related to CAM-2996
fix(case): fix case example
chore(login): couple app authorization check to engine auth config

related to CAM-1534
test(login): test access authorization check on login

related to CAM-1534
chore(standalone): add spin process engine plugin

- also adds plugin to dev setup

related to CAM-2966
chore(pom): remove hard spin dependency

related to CAM-2966
chore(pom): add connect dependency to standalone webapps

- also add connect plugin to process engine configuration to
  standalone webapps

related to #CAM-2706
chore(webapp): generated form
fix(UI-TEST/tasklist): amend urls-spec
chore(UI-TEST/cockpit): add suspension elements
chore(pom): adjust spin/connect dependencies

related to #CAM-3061