ARM CMSIS module for Arduino IDE

Source is the one provided by ARM at:

• CMSIS 4 (legacy): https://github.com/ARM-software/CMSIS/
• CMSIS 5: https://github.com/ARM-software/CMSIS_5

Main CMSIS URL is https://developer.arm.com/tools-and-software/embedded/cmsis

API Help can be found at https://arm-software.github.io/CMSIS_5/General/html/index.html