CMake design doc: update to the latest mbed-tools updates ...

Refactor Mbed OS CMake scripts section - details about mbed-os/cmake scripts
Add mbed-tools - how mbed-tools built an application with CMake

cmake: Using Arm compiler from Mbed Studio ...

Added a command line option `-DMBEDIDE=ON` which allows using Arm
compiler shipped with Mbed Studio on local machines.

Signed-off-by: Devaraj Ranganna <devaraj.ranganna@arm.com>

cmake: Fix arm compiler build failures ...

Update arm compiler flags which were causing build failures.

Remove `-MMD` flag as it is not recognised by the Arm compiler.

There are no common flags between compiler, assembler and linker. The
compiler expects `-mcpu` whereas assembler and linker expects `--cpu`.

The `COMMON_FLAGS` in `cmake/toolchains/ARM.cmake` are not recognised by
assembler and linker.

Signed-off-by: Devaraj Ranganna <devaraj.ranganna@arm.com>

cmake: Re-order cmake script inclusions ...

The script `cmake/env.cmake` enables languages and in the case of Arm
compiler, `CMAKE_SYSTEM_PROCESSOR` is expected to be set before a
language is enabled. `CMAKE_SYSTEM_PROCESSOR` is set in
`cmake/core.cmake`. Therefore, `cmake/core.cmake` is included before
`cmake/env.cmake`.

Similarly, `cmake/profile.cmake` sets compiler options, hence it is
included before enabling languages in `cmake/env.cmake`.

Signed-off-by: Devaraj Ranganna <devaraj.ranganna@arm.com>

cmake: Stringify develop.cmake ...

Cleanup develop.cmake to remove ARMC5 and uArm compiler flags and
stringify cmake variables.

Signed-off-by: Devaraj Ranganna <devaraj.ranganna@arm.com>

CMake: remove version number from ARM toolchain ...

The version number was required previously when ARM Compiler 5
and ARM Compiler 6 were both supported. There was a significant
underlying change between the two that justified having distinct
build options settinfgs. It is very unlikely that such a major change will happen
between ARM Compiler 6 and future versions. It is therefore also very unlikely
that distinct option settings for future versions will be needed.
We should therefore avoid appending version number the same way we do not
append it to GCC toolchain configuration settings.

CMake: Fix CI error due to dir restruct of rtos and storage dirs

CMake: Fix failure due to restructure of rtos and ppp directories

CMake: Add Travis script to run a basic CI check for PRs

CMake: Add support for WIO_3G target

CMake: Add support for DISCO_L475VG_IOT01A target

CMake: Add support for NRF52840_DK target

CMake: Add support for K64F target

CMake: Add support for storage dir

CMake: Add support for rtos dir

CMake: Add support for platform dir

CMake: Add support for hal dir

CMake: Add support for features dir

CMake: Add support for events dir

CMake: Add support for drivers dir

CMake: Add support for connectivity dir

CMake: Add support for components dir

CMake: Add support for cmsis dir

CMake: Add CMake scripts

CMake: Intentionally untrack CMake generated files

CMake: Add design document

Merge pull request #13811 from pan-/ble-conditional-compilation ...

Ble conditional compilation

Merge pull request #13698 from boraozgen/bugfix/spif-read-dummy-bytes ...

Fix SPIF read dummy cycles not being reset

Merge pull request #13862 from jeromecoutant/PR_RTS_FREE ...

STM32 SERIAL: free RTS/CTS pins

Merge pull request #13846 from 0xc0170/fix-stm32-usb-header ...

STM32 usb: fixing missing header file