Squashed commit of the following:

- use pointer instenad struct for CMultiTypeDataArrayWrapper internal
  bson data because force an unwanted alignement for class, as reported
  by asan library.

- remove warning in compilation due to use of wrong bson typed struct.

- fix memory leaks CMultiTypeDataArrayWrapper dow to pointer usage.

- remove performance tester from xcode project, need to be
  reimplemented, code is not deleted for try to recode.

- fixed the bug that prevent the io driver to be deinitilized when
  a cu controller is removed.

- UIToolkit is now removed.

- implemented the burst management within KeyDataStorage driver

- defined the structured data type for Burst execution (chaos/common/da-
  ta/structured/Dataset.h) and an RPC action for control unit to add a
  burst request to the driver queue. The driver KeyDataStorage have a
  queue that need to be used to check a a burst request is pendig.

- storage type constant internally to class KeyDataStorage are used as
  bitfield to simplify the burst storage feature

- RPC now don't use SerializationBuffer that in future will be depreca-
  ted and has been added the RPC echo test for MDS message channel

- Storage Agein now check that tags vector is not defined or empty to
  permit the erase of the stored dataset

- implemented api on mds (server/client) for the submition of burst
  information