Merge branch 'feature/variadic-variant' into development
# Conflicts:
# .gitignore
# arduino/examples/Vector_Examples/Example_Vector_1_simple_use/Example_Vector_1_simple_use.ino
# include/etl/version.h
# library.json
# library.properties
# meson.build
# support/Release notes.txt
# test/vs2019/etl.vcxproj.filters
