- Using __WFE (instead of __WFI) in the example.
- Added link to application note about low power operations.

CMSIS-Core: Changed IAR __CLZ workaround to respect a new guard signaling availability of __CLZ in future versions.

- Fixed example for osThreadGetName.
- Enhanced details for all osXXXId_t with references to functions returning those object ids.

__CORE__ is IAR specific, similar to __ARM_ARCH_ macros that GCC defines.

Note: The later versions of IAR as one tested (>7.80.4) might contain these definitions,
thus we are defining them right after inclusion of the cmsis_iar header file.

Fix __set_FPSCR and __get_FPSCR for (non-ARM) Clang

The clang assembler does not know the vfpcc register, compiling
code using CMSIS will therefor fail.

This patch will use the corresponding builtin thats available on
Clang, and is supposed to be supported with GCC since Version 5.

A patch for GCC 7 is available, fixing a mistake
(https://gcc.gnu.org/ml/gcc-patches/2017-04/msg00443.html).
Optimistically this patch enabled the builtin for GCC 7.1.

The prev-pointer of the running threads mutex list was not set when multiple mutexes are acquired at a time. This leads to a corrupted list if the mutexes are not freed in reversed order.

 - Added ARM Compiler 6 support
 - Updated Cortex-A core functions
 - Updated Startup and System files