feat(resize): rework resize feature

Default resize feature has two modes now
- mode 1: fix bendpoints and do not compensate shape movement (looks like
          a movement of child shapes for the user [used in participant /
	  lane right now]

- mode 2: do not fix bendpoints but compensate shape movement for children
          looks as if children have not been moved [used in subprocess]

Change participant boxing when dropped on process diagram.

Closes CAM-250
Merge branch 'develop' of github.com:camunda/camunda-modeler into develop
feat(message flow): disable create on diagram
fix(call activity): resize updates boundary pos
fix(boundary event): disable move of activities on connection