Adding Feedback Follow-up

- Tracing Dump moved to Idle thread (updated scheduler and main to
support)
- added basic interrupt support in the kernel and UART
- added CU_SYSC4906 startup files instead of the standard CMSIS
- updated the UART pack and added it (files now configurable)
- added the RavenOS pack
- some consideration regarding possible stack corruption between the
tracing buffer and printf (avoid last couple of array elements)
- flag to enable printf in kernel
- thread revival if dead with a create
- minor clean-up