Compilation with g++12

• Fix compilation with g++ 12

Fix C++20

• Fixes issues with comparison operator ambiguity and C++20 standard
• Fixes deprecated warning errors with C++17 and C++20 (std::iteration, std::allocator)

Full Changelog: v0.1.0...v0.1.1

Version 0.1.0

• At last a version number that makes some sense.
• Includes pull request from @benrobby (thanks)
• Fix deprecated warning with gtest

Extra security for cas_vector iterators

For cas_vector iterator, by default, the operator[] now has a strong thread safety: it is safe to use by multiple threads even accessing the same cell.
Compared to ts_vector which are only safe when different threads access different cells.