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