Don't reset the stack location when starting the scheduler in Cortex-M0 ports as the vector offset register is not implemented and XMC1000 devices have their application vector address somewhere other than 0x00.
Add portYIELD_FROM_ISR() macros to Cortex-M ports. The new macro just calls the exiting portEND_SWITCHING_ISR() macro.
Remove code from the MSVC port layer that was left over from a previous implementation and become obsolete.
Richard Barry