* wip initial commit

* draft migration completed

* removing unnecessary storekey arg

* additional cleanup

* adding updates to migrations and tests additional assertions

* updating and moving migrations code

* adding additional checks to tests

* cleaning up tests

* cleaning up tests

* updating inline doc comments, checking err return

* using InitMemStore in favour of InitializeCapability, adjusting tests

* adding assertion of channel capabilities migration

* adapting migration code to use get/authenticate capability

* adding changelog

* updating tests

* set middleware enabled for existing channels

* assert middleware enabled in tests

* updating changelog with middleware enabled flag

(cherry picked from commit 8d56b94)

# Conflicts:
#	CHANGELOG.md