Add CMSIS-SVD Registers Description support

Embedded targets have dozens of peripherals, each with dozens of registers. Recognizing and showing those registers in the debugger is a tremendous help to the developers.

ARM has developed a special format (CMSIS-SVD [0]) which can be used [1] by microcontroller producers to describe the internal peripheral registers of their products.

All of the main ARM microcontroller development IDEs support parsing and using those files.

Please consider adding CMSIS-SVD support into Bare-Metal and/or Debugger components of Qt Creator.

Thank you.

[1] http://www.keil.com/pack/doc/CMSIS/SVD/html/index.html

[2] https://github.com/posborne/cmsis-svd