* Fix compilation with -Wsign-conversion
For tests with GCC and Clang
Fixes https://github.com/ETLCPP/etl/issues/632
* Fix support of negative Id in type_lookup.h: type_from_id
* Fix element access arithmetic in atomic_gcc_sync.h fetch_add/fetch_sub
* Fix rounded_integral_division.h: divide_round_half_odd(): direction is always 1
* Fix bitset_new test: bitset is implemented as little endian container
* Fix test_bsd_checksum.cpp: endian test was only implemented for little endian
* Fix endianness test
* Fix endian in crc tests
* Fix test_fnv_1
* Fix test_hash
* Fix test_jenkins
* Fix test_memory
* Fix pearson test
* Fix test_xor_rotate_checksum
* Fix murmur test
Updated CI scripts
#786 u8string
#783 Cannot insert existing value to full set
#781 etl::multi_span::iterator::operator *() fails if first span is empty
#780 endian enum_type produces useless-cast warnings
#779 hash.h: warnings produced with -Wfloat-equal
