fix(qa): adjust DashboardIT to modified invoice example

related to #CAM-2800
chore(integration-test): workaround for non-public Connect API

related to CAM-3061
chore(spin/connect): process engine class names
chore(generated/form): add error message when value is invalid

related to CAM-3002
chore(example): imporve filter label

related to #CAM-2800
chore(pom): set alpha versions of spin and connect
 chore(release): Prepare release: set version to 7.2.0-alpha6
 chore(release): Prepare next development version: 7.2.0-SNAPSHOT
fix(filter/candidateGroups): do not overwrite candidateGroups

related to CAM-3071
fix(filter/task): handle followUpBeforeOrNotExistent proper

related to CAM-3080
chore(parent): use bom as parent of parent pom

related to #CAM-2998
chore(engine): use existing method for json serialization

related to #CAM-3080
chore(pom): add wildfly compatibility profile for resteasy 3.0.8.Final

related to #CAM-2749
fix(rest): set leading / of variable links by hand

- with resteasy 3.0.8.Final (wildfly) a / in a uri part
  is encoded as %2F, so we have to set it by hand and remove
  it form the uri part

related to #CAM-3039
chore(pom): set template engine version to alpha
feat(rest): embed identity links in hal task

related to #CAM-3093
chore(rest): fix mock inconsistency

related to #CAM-3093
chore(rest): reorganize hal resource packages

related to #CAM-3093
fix(filter/extend): set followUpNullAccepted when extending

related to CAM-3080
feat(engine): task queries by variables with number values

- querying by number matches variables of any numeric type, i.e. long, int
  short and double

related to CAM-2939