Fixes, updates and new features

#615 Addition of etl::expected
#649 Changed intrusive_list and intrusive_forward_list iterator constructor parameter from reference to pointer.
#667 etl::span copy constructor with original span with fixed extent causes pend iterator to be invalid
#668 byte_stream changes that add error exceptions have changed previous behaviour
#670 span equality operators
#672 HFSM-specific start() and reset()
Fixed span templated copy constructor
Added destination_router_id parameter overrides to receive() virtual functions
Added ""_sv string view operators
Added M17 CRC
Added repair() to etl::circular_buffer
Added etl::contruct_object_at, etl::get_object_at and etl::destroy_object_at
Added etl::is_aligned, etl::alignment_exception and etl::alignment_error
Removed unnecessary code in etl::vector_ext::repair()
Updated sanity check make files
C++03 compatibility improvements

Added emplace by index to variant (variadic)

#660 byte_stream_reader::skip error

Emplace member functions return reference to emplaced value

20.35.10

Improved emplace testing

Minor updates

#657 -Wpedantic-failure. Removed superfluous semicolons
#653 CMake - Don't warn on tag missing when subproject
#651 result<T, void> specialization
#650 Fix result<void, E> default ctor
Removed Ubuntu 18.04 from Github Actions
Added Ubuntu 22.04 to Github Actions

Type traits improvements, etl::visit fix, removed unused macro

#648 Improve is_constructible, is_copy_constructible, is_move_constructible for type traits with default definitions
#645 Avoid 'missing return statement at end of non-void function' in etl::visit<>().
Removed unused ETL_USE_MEM_BUILTINS option

Updated etl::delgate to handle const functors correctly

Fixed C++03 specific conditional compilation in delegate header

#643 Don't use push_macro and pull_macro with Tasking compiler

20.35.6

#643 Don't use push_macro and pull_macro with Tasking compiler

Incorrect C++03 enable_if syntax

Incorrect C++03 enable_if syntax for etl::array_view and etl::span

#639 Only build tests if top level project

Changed CMakeLists.txt so that the ETL tests will only be built if it is the top level project.

Fix bug in optional emplace for pod type specialisation

#636 Fix bug in optional emplace for pod type specialisation