Updated gtest

Updated readme

Fixed const detection in containers assuming subscript operator

Removed unneeded template keyword

Renamed guard placeholder

Typo fix

Variant of private default constructible fix invalid return

Replace deprecated std::aligned_storage

aligned_storage will be deprecated in C++23.
The paper which proposes this deprecation is P1413R3.
This commit applies the recommend fix provided in that paper.

Closes #136.

Explicit big_endian of std::uint32 to avoid error on some arm abi

Remove azure pipelines ubuntu-22.04, recently there is an errors that…

… C++ headers not found, need investigation.