Feature/s132v5

Using implementation from SDK unchanged instead

Add optional command line argument for specifying baud rate

Print feedback of supported baud rates if an unsupported value has been provided.

To avoid having to recompile the examples when switching between different baud rates, it can with this change be specified from the command line when running the examples.

When using max packet size of 700, the 115k2 variant of connectivity would fail with timeout when attempting to connect. Reducing to does seems to fix the problem. The root cause of the issue is not clear at the moment.

Update connectivity to add fix for att mtu

* Update connectivity bootstrap and patch files
* Increase buffers to avoid overrun when using large mtu sizes.
* Use SDK v12.2 instead of v12.1 to include fixes.
* Bump connectivity version number to 1.2.0.
* Leave default baud rate at 1Mbps.
* Add updated connectivity hex files.
* Remove old connectivity hex files.
* Add --reduce-paths option to keil proj files to to workaround Keil path issue.

The define EXTERN_C conflicted with the same macro definition included via windows.h.