feat(userguide): created docs for new tasklist

related to #CAM-2751
chore(bpmn20): update elements supporting camunda:inputOutput

related to #CAM-2400
chore(migration): update db patch notes

related to #CAM-2662
feat(engine): add followUpBeforeOrNotExistent to TaskQuery
related to CAM-2809
fix(userguide): remove delegate from tasklist docs

related to #CAM-2751
chore(enterprise): Add links to installation guide

Add links in download section to the installation guide
chore(user guide): update admin docs

related to #CAM-2845
chore(enterprise): update download 7.1.6
chore(migration): adjust patch script chapter

related to #CAM-2662
fix(guides): proof read and correct cycle infobox

related to #CAM-2858
fix(enterprise): dead links to installation guide

fix dead link in download section
chore(cmmn): update cmmn reference to use non-fluent api

- adds a section that describes the two API concepts: Fluent vs Classic

related to CAM-2803
chore(migration guide): add hint about migrating instances

related to #CAM-2865
chore(user guide): update tasklist section

related to #CAM-2751
fix(cmmn): proof read and correct

related to #CAM-2803
feat(user-guide): add historic case instance to history section

related to #CAM-2839
chore(user guide): rename cockpit start page to dashboard

related to #CAM-2875
fix(migration guide): proof read and correct
feat(bpmn): process model with terminate event

first version to document terminate events
feat(cmmn-reference): variable listener extension element

related to CAM-2238