Various fixes

#749 Code change causes warning with armcc compiler
#753 IAR's overload resolution struggles with etl::span::span(etl::array&)
#754 ambiguous etl::bit_stream_reader::bit_stream_reader() for some etl::span
#755 warning about constexpr in array.h
#756 Parameter pack compilation error
#758 Move assignment not working for non-empty containers
#761 Make "private" includes relative
#765 etl::optional cannot be constexpr
#766 etl::unique_ptr::reset() can call deleter with nullptr argument
Re-enabled bit_stream_writer tests

Updates & fixes

#696 fsm/hfsm self-transitions
#702 etl::message not trivially_copyable
#744 Feature request: Get time when next timer will expire etl::callback_timer
#745 Assertion triggered in hash.h when compiling for MSP430
#746 Missing etl::legacy::variant overload of emplace with 0 Arguments
#748 armcc error on vector::insert
Fixed unexpected pool release behavior when the pool is empty
Added C++03 compatible etl::move and etl::move_backward
Allow C++03 delegate in etl::callback_timer
Change to require semicolons after debug count macros
Re-enabled tests for etl::string_ext
Removed redundant #includes
Added MutexMessageRouter example

Fixes for etl::span, etl::expected and etl::variant

• #737 etl::equal specialisation for etl::span is deduced wrongly when using STL and CPP20. Added C++20 four iterator std::equal variants.
• #738 etl::expected assignment operator won't work when TValue and TError are the same type. Changed assignment from etl::unexpected to use variant::emplace instead of direct assignment.
• #739 Could not compile ETL with gcc 9.4.0 (C++11). Added compatibility for GCC-9 + C++11. Added missing return reference from emplace member function in variant_variadic.h
• Removed many -02 warnings for GCC-13

Various fixes

• #733 Fix etl::expected assignment from etl::unexpected.
  Added unit tests for changes
  Added missing etl::forward in etl::expected::emplace
• #734 Add missing new line at end of files.
• #735 Fix bug in minmax include mismatch detection.

Minor fixes and enhancements

#723 Added missing final CR/LF to result.h.
Fixed etl::optional arrow and dereference operators.
Enhanced min/max push/pop headers. Detects mismatched header includes.

Fixes and updates

#708 Fix missing class key with friend.
#709 intrusive_list::iterator operator -> should not dereference pointer before return.
#710 Calling accept on etl::variant visits a copy instead of the original object.
#711 Added etl::is_forward_link, etl::is_bidirectional_link and etl::is_tree_link to intrusive links. Added Constructors, access and status member functions to intrusive links.
#712 Unable to use etl::optional with non-default-constructible POD objects.
#716 etl::variant (variant_varadic) default constructed state
#720 etl::optional rvalue value_or() broken
#722 Bitset accesses memory out of bounds
#725 variant_pool create method should use etl::forward
Modified etl::visitor to allow direct specification of the argument type.
Added etl::is_visitor trait.
Removed default link type for etl::intrusive_list and etl::intrusive_forward_list

Note: The updates to etl::visitor changes how arguments are passed. Previously arguments would always be passed by reference. The new behaviour is to pass the arguments exactly as the template parameter specifies.

The declaration below defines virtual visit functions that accept Square&, Circle& and const Triangle&
etl::visitor<Square&, Circle&, const Triangle&>

#700 Compilation error for [] map operator.

Fixed map const placement new issue.
Re-enabled memcast tests.

New features, updates and fixes

#663 Make unit tests compile for C++20
#675 Compilation error in optional.h
#684 Added sanitization fix for MinGW
#687 Build failure. constexpr keyword before template keyword
#689 Add as_bytes and as_writable_bytes
#690 Add rvalue accessors to expected and optional and update constructors
#692 operator [] for flat_map always calls default constructor for mapped_type
#695 Visiting a const variant (variadic)
#698 Behaviour of bidirectional_link nodes. Links are now cleared when unlinked
#699 Optional(POD) operator bool explicit
Optimised map/flat_map/unordered_map [] operator and insert()
Removed [] operator for reference_flat_map
Unit tests compile for C++11
Fixed C++11 constexpr compatibility
Removed redundant 'const' in template parameters
Updated CI scripts to enable C++ standard and optimisation selection
Updated static constant definitions
Fixed incorrect return types for reverse iterator begin() & end()
Updated C++ standard conditional compilation for reverse iterator functions
Fixed latest Address Sanitizer issues
Message packet unused parameter fix
Added ETL_OR_STD17 macro as the namespace for size()
Added Tasking compiler
Fix type traits generator
Fix test array sizes
Changed some ETL_ASSERT macros to ETL_ASSERT_OR_RETURN
Updated CMake files to allow C++ standard selection
Replaced ETL_ASSERT_AND_RETURN with ETL_ASSERT_OR_RETURN
Changed native char8_t check
Renamed Github vs2022.yml to visual-studio.yml
Updated Unittest++ checks
Comments and noexcept updates to placement new
etl::variant (variadic) refactor and updates for C++ standards compatibility
etl::overload available in C++17 only
map/flat_map speed optimisations
Various C++03 compatibility updates for maps
Refactored Bash compilation scripts to allow selection of C++ standard and optimisation level
Renamed Bash compilation scripts. Changed 'sanity checks' to 'syntax checks
Some internal constant case changes from all upper to capital case

Migrate the Visual Studio project to VS2022

#664 Migrate ETL project from VS2019 to VS2022

Fixed warning in unit tests, modified virtual function access for allocator

#649 Fixed the false positive 'array-bounds' errors for ETL unit tests.
#652 Fixed false positives 'maybe-uninitialized' errors for ETL unit tests.
Moved virtual functions in etl::fixed_sized_memory_block_allocator from private to protected.