New PATCH release 03.00.06

Changes since 03.00.05:

- Removed one Compliler warning.
- Added all functions for reading carrier device ID.
- Started I2C mux preparation
- made some parts of the CAN communication theoretically more reliably, unfortunately this does not help with the issues with concurrent bus access
- added missing wait/post on the CAN semaphore when sending normal (i.e. non-firmware upgrade) frame on master for a CAN slave

- added information how to enable automatic download before debugging
- added instructions how to setup a debugger in QtCreator
- Fixed cmake not properly being configured for a cross platform target. It was producing proper output files but preventing the use of a debugger.