Fix all Doxygen errors and make any future errors fatal (#118) ...

* Start working on fixing doxygen warnings

* Upgrade doxyfile to Doxygen 1.9.1

* Clean up some unmatched groups and add some exclusions

* Fix docs for rtos::ThisThread not showing up

* Fix up KV store docs

* Fix incorrect @files, some more incorrect groups

* Fix lots of broken links

* Start fixing mbedtls groups

* Fix more mbedtls docs

* Fix remaining mbedtls files with missing or incorrect grouping

* Fix a huge amount of PSA docs errors

* Fix a few more mbedtls docs errors

* Fix __cplusplus not defined for docs, clean up call in callback typedef, fix some docs errors

* Fix some broken doc links in HAL headers

* Fix more PSA doc errors

* Fix some doxygen errors in networking code

* Fix lots of network related doc errors

* Try and fix some CI failures

* Use Doxygen Action instead of doxygen in Mbed container to get the right version

* Try removing docs check

* Add first part of doxygen action

* Add next part of doxygen action

* Fix yaml syntax error

* Add in license check fix

* Try using verbose scancode

* Fix some more docs issues, workaround scancode-toolkit#3179

* Clean up the LoRaRadio get_state() function on each implementation.  Also fix some other compile and doc errors.

* Fix all remaining doxygen errors

* Fix escaping, for realsies this time

* Remove Doxygen unsupported config options, fix some more get_status() declarations

* Fix some UNITTESTS build errors

* Fix one more compile error

* Another unittest error

Fix a few mistakes in the I2C docs. (#66)

Change default serial baudrate to 115200 (#58)

Lots of usability improvements for the I2C API. Better docs and new top-level functions. (#64) ...

* Lots of usability improvements for the I2C API.  Better docs and new top-level functions.

* Document frequencies

* Tabs to spaces

* More style fixes

* Run astyle

* Clean up docs

* Add note about addressing, change 10 bit to 11 bit

* Fix spellcheck

* Fix paste error

* Oops, fix accidental change

Fix ABI differences between mbed-baremetal and mbed-os, remove PlatformMutex

fix: typo in PwmOut.h (pulsewith -> pulsewidth)

add: PwmOut::read_pulsewitdth_us() for compatibility

rename: read_pulsewitdth_us to read_pulsewidth_us

GPIO: Use uintptr_t for gpio_irq_api context ...

The HAL gpio_irq_api stores object IDs, which serve as a form of context
for the dispatch of the interrupt handler in the drivers level
InterruptIn Class. The way this is achieved is that the InterruptIn
Class casts its address to uint32_t, which is stored as the ID.
This results in compilation failure when the size of an object pointer
is greater than uint32_t, for example when building on a PC for unit
testing.

In order to allow Unit Testing of the InterruptIn Class, we replace the
use of uint32_t with uintptr_t (type capable of holding a pointer),
which allows portability and expresses intentions more clearly.
In aid of this latter goal, we also replace the use of the name "id"
with "context", to improve clarity - these are addresses of the context
related to that callback.

InterruptIn: add note about enabling interrupts in rise/fall ...

Fixes #8188
Make it obvious, only calling rise/fall methods, IRQ are active. Nothing more needed.

CAN: Use uintptr_t for can_irq_ids ...

The HAL can_api stores an array of IDs in order to dispatch interrupts
to the correct CAN object. The drivers level CAN Class casts a pointer
to itself to an uint32_t, which is stored as the ID and then cast back
to a CAN * in order to call the correct handler. This results in
compilation failure when the size of an object pointer is greater than
uint32_t, for example when building on a PC for unit testing.

In order to allow Unit Testing of the CAN Class, we replace the use of
uint32_t with uintptr_t (type capable of holding a pointer), which
allows portability and expresses intentions more clearly. In aid of this
latter goal, we also replace the use of the name "id" with "context",
to improve clarity. These are addresses of the context related to that
callback.

QSPI: Move destructor into source file ...

This allows the entire QSPI class to be mocked/faked for unit testing
purpose, without dependencies from the real implementation such as
`qspi_free()` from the HAL.

Add missing include for PinNames.h

Merge pull request #14805 from rkotan/I2C_Multiple_Buses_fix ...

i2c: fix issue #14735 with multiple buses

Merge pull request #14688 from MubeenHCLite/CAN_rxinterrupt_fix ...

Solution for mutex problem in CAN read ISR

Corrected the conditional compilation of RawCAN.

Indentation set for the comments

Remove `#ifdef UNITTEST` from MbedCRC.h ...

Production code should not contain any test-specific checks. Rather
than checking `UNITTEST`, MbedCRC.h can simply include in all cases
<mstd_type_traits> whose unit test stub exists.

Also remove the `UNITTEST` macro from CMake definitions of kvstore
unit tests which depend on MbedCRC.h.

Added documentation for the implementation

Spell check corrected

Resolved review comments

Resolving the astyle error

Updated the Licenses for RawCAN and aligned indentation

Removed the new line at the end of file.

Merge branch 'master' into CAN_rxinterrupt_fix

Added Raw CAN (unlocked can read api) and updated the code for the ...

rxInterrupt to work for all CAN instances

Fix hanging with multiple I2C buses ...

Make the _mutex non-static and remove _owner and acquire()

When two or more I2C buses are used then static__mutex and _owner are
shared between all I2C class instances in the program. That
wastes time to reconfigure periphery on every transfer.

Make _mutex non-static. Remove _owner and acquire() method
because in non-static case they have no practical meaning.

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

Add CANMessage deep comparison operators

Remove shadowing member variables ...

- The variables shadow SerialBase::_tx_enabled and SerialBase::_rx_enabled
- Update interrupts when input/output is enabled to avoid infinite congestion
- Update comments

Add CANMessage deep comparison operators