Rename optimisation problem setup variables (#4481)

* Rename `IPNVARS` to `N_ITERATION_VARIABLES_MAX` for consistency with style guide

* Rename `IPEQNS` to `N_CONSTRAINT_EQUATIONS_MAX` for consistency with style guide

* Rename `ioptimz` to `i_process_run_mode` for consistency with style guide

* Rename `minmax` to `i_figure_merit` for consistency with style guide

* Rename `neqns` to `n_equality_constraints` for consistency with style guide

* Rename `nineqns` to `n_inequality_constraints` for consistency with style guide

* Rename `ncalls` to `n_model_calls` for consistency with style guide

* Rename `nvar` to `n_iteration_variables` for consistency with style guide

* Rename `nviter` to `n_solver_iterations` for consistency with style guide

* Add input variables to obsolete dictionary

* Rename solver variables to align with style guide

* Post rebase fixes

* Rename solver variables to align with style guide

Correct file_prefix of IN.DAT not in cwd (#4295)

Convert superconducting TF data structure to dataclass (#4281)

* convert superconducting tf coil to dataclass

* remove duplicate models

Add low aspect ratio demo regression test (#4020)

* add file to regression/input_files

* update obsolete variables

tmargmin_cs -> tmargmin
fvsbrnni -> f_c_plasma_non_inductive

* updated eudemo file from alex

* change xenon impurity

* remove unnecessary file

* update file

Run 0.2% tolerance on CI/CD instead of 0% (#3973)

Add configurable inequality tolerance to the VMCON solver (#3878)

Remove CMake and make PROCESS a pip installed package (#3842)

* Remove build-time creation of dicts

The get_dicts() now does what dict creation build-time scripts did. Instead of writing a file, the dicts are created when get_dicts is first called and are cached for a given Python PROCESS

* Remove CMake

* Remove FORD docs

* Remove automatic Fortran namespacing from tracker

The tracker now requires tracking config to be of the form <arbitrary namespace>.<MFile variable>

* Update docs to remove references to CMake and Fortran

* Remove empty utilities package

Upversion process to 3.1.0 (#3111)

Upversion process to 3.0.2 (#3032)

Prepare 3.0.1 upversion (#2981)