Dclab

- setup: bump numpy from 1.17.0 to 1.21.0
- setup: bump scipy from 0.14.0 to 1.8.0
- setup: drop support for Python 3.7

- fix: regression since 0.39.0; contours with wrong index where not
repaired
- ref: Python distutils library is deprecated
- ref: some scipy namespaces are deprecated

- enh: allow to specify unique_id of PolygonFilter when loading
from file

- fix: not all statistics exported if no feature was specified

- fix: fix accessing inherited non-scalar temporary or plugin features
for RTDC_Hierarchy class (165)
- fix: properly handle user-defined (temporary or plugin) features
when exporting to HDF5 (166)
- enh: add "shape" keyword argument in RTDCWrite.store_feature to
allow the user to pass the correct data shape; this reduces warning
messages when using the RTDCBase.export.hdf5 functionality
- ref: simplify data export to HDF5 with generator function
- tests: use correct tdms-dataset for tdms tests

- fix: enable loading of non-scalar plugin data as h5py.Dataset (162)
- build: minor fixes in CI and testing pipeline