Pyimpspec

- Added `Circuit.to_drawing` method for drawing circuit diagrams using the `schemdraw` package.
- Added `schemdraw` as an explicit dependency.
- Added support for using the `cvxpy` package as an optional solver in DRT calculations (TR-RBF method only).
- Added `cvxpy` as an optional dependency.
- Added `CircuitBuilder.__iadd__` method so that the `+=` operator can be used instead of the `CircuitBuilder.add` method.
- Updated `Element.set_label`, `Element.set_fixed`, `Element.set_lower_limit`, and `Element.set_upper_limit` methods to return the element so that the calls can be chained (e.g., `Resistor(R=50).set_label("ct").set_fixed("R", True)`).
- Updated the default terminal labels used in circuit diagrams.
- Updated how the title is generated in the `mpl.plot_fit` function.
- Updated minimum versions for dependencies.

**Breaking changes in the API!**

- The `KramersKronigResult` class has been renamed to `TestResult`.
- The `FittingResult` class has been renamed to `FitResult`.
- `DataSet`, `TestResult`, and `FitResult` methods such as `get_bode_data` that previously returned base-10 logarithms of, e.g., frequencies now return the linear values.
- The `perform_exploratory_tests` function now returns a list of results that have already been sorted from best to worst.
- The `score_test_results` function has been removed.
- The `string_to_circuit` function has been renamed to `parse_cdc`.
- The `fit_circuit_to_data` function has been renamed to `fit_circuit`.
- Some of the plotting function signatures have changed:
- Added `label`, `legend`, and `adjust_axes` keyword arguments.
- Added color arguments to the `plot_circuit` function.
- The `plot_mu_xps` and `plot_exploratory_test_results` functions now take a `List[TestResult]` as the first argument.
- Some argument names have changed (e.g., `nyquist_color` in `plot_circuit` has changed to `color_nyquist`).



- Added support for calculating the distribution of relaxation times using a few different methods.
See the `calculate_drt` function, which returns a `DRTResult` object, for details.
- Added new functions to `plot.mpl` (`plot_drt`, `plot_complex_impedance`, etc.).
- Added `cvxopt` and `scipy` as explicit dependencies.
- Added `get_connections` and `substitute_element` methods to the `Circuit` and `Connection` classes.
- Added a `get_relative_error` method to the `FittedParameter` class.
- Added a `calculate_score` method to the `TestResult` class.
- Added progress system that can be provided a callback to obtain information about progress during, e.g., Kramers-Kronig testing.
- Added a `CircuitBuilder` class as an alternate means of creating circuits.
- Updated the `DataSet` class to sort data points in descending order of frequency when instantiated.
- Updated the `plot.mpl.plot_*` functions to make use of logarithmic scales instead of logarithmic values where applicable.
- Updated the appearance of the figures generated by `plot.mpl.plot_mu_xps`.
- Updated the `DataSet.set_mask` method to accept the use of `numpy.bool_` values in masks.
- Updated the return value of the `to_latex` method of circuits, elements, and connections.
- Refactored to use generator expressions when performing, e.g., Kramers-Kronig tests.

- Added `num_per_decade` argument to the `pyimpspec.plot.mpl.plot_fit` function.
- Added sorting of elements to the `to_dataframe` method in the `FittingResult` class.
- Added `tabulate` package as explicit dependency.

- Added support for `.mpt` data format.
- Refactored code.

- Added GitHub Actions workflow for testing the package on Linux (Ubuntu), MacOS, and Windows.
- Fixed issues that prevented using the package with anything but Python 3.10.

- Added support for parsing the `.i2b` data format.
- Added support for parsing the `.P00` data format.
- Updated minimum Python and dependency versions.
- Updated documentation.
- Refactored code.
- Removed support for parsing `.xls` files.