refact(filter/modal): refactor the handling of filter modal dialog

related to CAM-2896
chore(filters): clean up code

related to CAM-2896
feat(task variables): add task variables display

Related to: CAM-2607
chore(bower): resolve camunda-bpm-sdk-js through bower

related to #CAM-2703
fix(debugger): remove debugger statment
Merge branch 'master' of github.com:camunda/camunda-tasklist
Merge branch 'master' into CAM-2756
WIP: regexp recognizes variable names with spaces