Added links in revision history and added comment on update configuration files. Renamed the section "RTX5 Specifics" to "RTX5 Specific API".

Improve NVIC virtualization mechanism

Reviewed CMSIS-Pack Indes Files section and updated Publish a Pack section as requested by SDCMSIS-562.

NVIC_SystemReset() is another function that can be useful to virtualize.
Add NVIC_SystemReset() to the set of functions tthat can be virtualized
via CMSIS_NVIC_VIRTUAL.

The NVIC functions are virtualizable through their defines and the
default implementations. However, there is no way to override the
defines without doing something like forcing a header file to be
included via compiler build flags. Instead, include a standardly named
"cmsis_vectab_virtual.h" and "cmsis_nvic_virtual.h" based on whether
virtualization is desired (via CMSIS_VECTAB_VIRTUAL and
CMSIS_NVIC_VIRTUAL).