0.21.0

Enhancements

The lhc module now has a new function, apply_lhc_colinearity_knob_delta, to apply a variation on top of the colinearity knob variables.
The make_lhc_beams function now has a specific argument for both horizontal and vertical emittances (resp. emittance_x and emittance_y) to enable differentiating the two. The default value for each is the same as previously. If you were calling the function without specifying the emittance argument, you will not see changes. If you used to specify the argument, then switch to the new ones.
Added a version module, with a convenience function to get version, platform and runtime information for debugging and reporting purposes.

The get_cminus_from_coupling_rdts function now properly handles methods that compute complex DELTAQMIN values in optics_functions.coupling.closest_tune_approach, and return a correct result.

Increased the minimum required Python version to 3.8.
Increased the minimum required numpy version to 1.21.
Increased the minumum required pandas version to 1.4.
Removed the dependency on sympy.
Relaxed version constraint on the matplotlib dependency, increased minimum version to 3.3.
Updated API documentation by specifying the version added for every public API classes, functions and methods.
Updated and cleaned up Continuous Integration workflows.
Modularised the release notes sources of the documentation.