eCAL 5.7.1

Changelog

eCAL v5.7.1:

* common:
  * static code analysis fixes
  * cmake fix for ecal unit tests
* apps:
  * ecal recorder
    * recording of none alphanumeric topic names fixed
    * delete measurements after upload
    * retry failed uploads
    * fixed crash on Windows 7
    * preparations for ROS2 middleware (rmw_ecal) layer done