added expand/collapse action for connection menu
restoring positions of elements inserted into edge
connections expanding to picture added
continuous rendering of expanded connection
fixed +/- rendering for container folding button
Merge branch 'master' of https://github.com/qreal/qreal into expanding_connections
diagram rendering rect is adjusted
Merge branch 'master' of https://github.com/qreal/qreal into expanding_connections
added embedded linkers for BPMN Subprocess
removed continuous reiniting of connection diagram, resize fix
partial fix of moving elements when expanding connection of inserting into edge
partial fix of moving elements when expanding connection of inserting into edge N2
saving expanded state to the repo
saving fold state of containers to the repo
a fix for correct restoring children of sorting container
Merge branch 'master' of https://github.com/qreal/qreal into bpmn_examples
initial infrastructure
reverted to Serializer, somehow working version
message flow added, verifier fixed for proper processing of message flows
added signal flow line