lgtm: Add initial LGTM configuration file ...

Add a starter LGTM configuration file that tells LGTM what sort of files
we have in Mbed OS, what dependencies need installing, how to configure,
and how to build.

We tell LGTM to build Mbed OS's unit tests for the host toolchain, as a
start.

We install pip so we can install pypi's version of CMake, which is newer
than the current LGTM default version of 3.13.4.

Merge pull request #14687 from JeanMarcR/STM32L5_NEW_CUBE ...

STM32L5 update drivers version to CUBE V1.4.0

Merge pull request #14667 from wernerlewis/use-gcc-except ...

Update GCC except.S to support ARMC6 and use GCC assembly with ARM toolchain in CMake

Merge pull request #14691 from adbridge/master ...

Add GitHub action for issue triaging script

Merge pull request #14689 from MubeenHCLite/HighSpeed_Async_SPI_limitation ...

Information on Asynchronous SPI limitation on High Speeds

Merge pull request #14662 from AGlass0fMilk/can-message-comparison-operators ...

Add CANMessage deep comparison operators

Merge pull request #14629 from artokin/phy_mode_and_channel_plan_master ...

Mesh api: Added PHY mode, channel plan IDs and configuration functions

Merge pull request #14574 from noonfom/string-buffer-length ...

Fix string buffer length in UUID trace helper

Merge pull request #14665 from LDong-Arm/frozen_tools_end ...

Travis: Move frozen tools check to the end

Travis: Move frozen tools check to the end ...

When the scripts for the old tools are modified (e.g. when a new
target is added), the frozen tools check fails but we allow the change
if it's really needed. By moving the frozen tools check to the end,
Travis doesn't terminate early and the other tests get to run.

CMSIS: Modify M0/M0+ GCC asm to support ARMC6

cmake: Remove armasm workaround for Cortex M55

cmake: Use GCC CMSIS assembly with ARM toolchain ...

CMSIS provides both GNU and legacy ARM assembly files. Instead of using
armasm and legacy asm with ARM Compiler 6, CMakeLists is modified to
use the GNU format with both GCC_ARM and ARM C6.

Add GitHub action for issue triaging script ...

Improve comments

Update GCC except.S to support ARMC6 ...

ARM Compiler 6 supports GNU-style assembly with armclang. Instead of
relying on armasm with the legacy syntax, GCC except.S is updated so
that it can be used with ARM as well as GCC_ARM toolchains. CMake is
updated to use this version.

Merge pull request #14684 from AGlass0fMilk/fix-kvstore-security-db ...

Fix missing `as_entry` method in KVStoreSecurityDb

Merge pull request #14683 from jeromecoutant/PR_WBBARE ...

Baremetal tests: enable BLE tests with NUCLEO_WB55RG

Merge pull request #14678 from ghseb/uartserial-shadowing-2 ...

Serial: remove shadowing member variables

Merge pull request #14674 from anttiylitokola/master ...

Update mbed-coap to version v5.1.10

Merge pull request #14671 from saheerb/master ...

enable aws example test in CI

Merge pull request #14668 from ikmdani/fix_i2c_read_13967 ...

Driver: I2C: STM32F2/STM32F4/STM32L1: Fix alternate i2c read.

Merge pull request #14664 from LDong-Arm/nrf52832_flashiap ...

Enable FlashIAP for MCU_NRF52832

Merge pull request #14593 from JeanMarcR/STM32F7_NEW_CUBE ...

STM32F7 update drivers version to CUBE V1.16.1

Merge pull request #14592 from JeanMarcR/STM32G4_NEW_CUBE ...

STM32G4 update drivers version to CUBE V1.4.0

Merge pull request #14557 from affrinpinhero-2356/feature_i2cTiming_Calculation ...

STM32: driver/Added I2C timing calculation algorithm

Merge pull request #14536 from jeromecoutant/DEV_STM32F0_LPTICKER_OPTIM ...

STM32: Add LP_TICKER and US_TICKER optimisation macro

Merge pull request #14426 from ARMmbed/feature_unittest_refactor ...

CMake: Refactor UNITTESTS CMake

Added information on limitation of asynchronous SPI at high speeds(MHz ...

ranges)

README update STM32L5 to CUBE V1.4.0

STM32L5 RNG : update for deprecated MCU version