Replacing flags field with has_swo_tracing.

Fixed gettimeofday for msvc

Fixed printf format string

- Corrected identation in reg.h
- Updated README.md
- Updated CHANGELOG.md
- Updated list of contributors

[feature] Improved support for STM32H7

Inproving huristic to handle cases where there is lots of valid data coming in that is starving out the time trace ops.

Trying to recover from buffer overruns where we may land in the middle of trace output.

Fixing buffer semantics.

Added a check that looks at connection results after 10 seconds and displays a diagnositic message if it looks like we are not configured correctly.

Checked that the trace port is configured.  Added log messages to share the configuration and to tell the user what to do if it is not configured.

Improved comments.