Merge branch '68-refactor-tests' into 'develop'

.gitignore

src/openqlab/analysis/__init__.py

src/openqlab/analysis/gaussian_beam.py

src/openqlab/plots/__init__.py

src/tests/test_analysis/test_cavity/opo_scan.csv

src/tests/test_analysis/test_cavity/opo_scan_zoom.csv

src/tests/test_analysis/test_cavity/test_finesse.py

src/tests/test_analysis/test_cavity/test_modematching.py

src/tests/test_analysis/test_phase/test_phase.py

src/tests/test_analysis/test_servo_design/fra_3.csv

...ests/test_analysis/test_servo_design/test_servo_design.py

src/tests/test_conversion/test_utils/test_human_readable.py

src/tests/test_conversion/test_wavelength/test_wavelength.py

src/tests/test_importers/test_keysight_csv/.DS_Store

src/tests/test_importers/test_rhode_schwarz/.DS_Store

src/tests/test_importers/test_tektronix/.DS_Store

src/tests/test_io/gzip_data_files/.DS_Store

src/tests/test_io/test___init__/test_read.py

src/tests/test_io/test___init__/test_reads.py

src/tests/test_io/test_data_container/test_data_container.py