0.6.1 beta: ARM compat, classical not and more controlled gates, integers in "results" and new Python API

Added
Linux arm64 Python wheel and Linux arm64 test workflow (GCC-Release)
"classical not" gate is back
"state" section in JSON now contains a new entry "norm" which is the square of the modulus of the complex number
C++ integration test
All gates can be controlled (including prep, measure). This is not new but was accidentally removed in 0.6.0.
New Python API execute_string and execute_file without having to create qxelarator.QX() and returning user-friendly Python type
Changed
Fixed README
"results" section in JSON contains integers instead of floats (those integers being the number of occurences)
In relation to previous point, "results" only relates to measurement register averaging, and no longer to quantum state when doing a single shot. For that, use the "state" section in the JSON.
Output float precision is 8 decimals instead of 6
Removed
Most Python tests - already covered in C++ integration test, and they didn't check much anyway