Make string optimization (#179)
* Add NO_STL std::reverse implementation (#174)
Follows the example implementation on [1].
[1] https://en.cppreference.com/w/cpp/algorithm/reverse
* Merge remote-tracking branch 'origin/feature/no_stl_unit_tests' into development
# Conflicts:
# include/etl/stl/alternate/algorithm.h
# include/etl/stl/alternate/iterator.h
# include/etl/version.h
# library.json
# library.properties
# support/Release notes.txt
# test/test_no_stl_algorithm.cpp
# test/test_no_stl_iterator.cpp
# test/vs2017/etl.vcxproj
* Fix merge function duplication
* Merge remote-tracking branch 'origin/development'
# Conflicts:
# include/etl/private/choose_pair_types.h
# include/etl/private/choose_tag_types.h
# include/etl/version.h
# library.json
# library.properties
# support/Release notes.txt
* Update README.md
* make_string optimisation. String length is calculated in compile time, no need to use strlen.
