Update environment and CI workflow

[jgliss]

• [x] deprecate support for python 3.6 and 3.7
• [x] remove basemap dependency
• [x] update CI.yml to support python 3.8-3.10
• [x] update CI.yml to also build and test on windows-latest
• [x] accommodate required changes in library due to new environment
• [x] remove future imports

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.13 :tada:

Comparison is base (01367b6) 34.90% compared to head (33d8ac6) 35.03%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## v145dev #45 +/- ## =========================================== + Coverage 34.90% 35.03% +0.13% =========================================== Files 31 31 Lines 12723 12730 +7 =========================================== + Hits 4441 4460 +19 + Misses 8282 8270 -12 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `35.03% <100.00%> (+0.13%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://app.codecov.io/gh/jgliss/pyplis/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F) | Coverage Δ | | |---|---|---| | [pyplis/\_\_init\_\_.py](https://app.codecov.io/gh/jgliss/pyplis/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F#diff-cHlwbGlzL19faW5pdF9fLnB5) | `100.00% <ø> (ø)` | | | [pyplis/calib\_base.py](https://app.codecov.io/gh/jgliss/pyplis/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F#diff-cHlwbGlzL2NhbGliX2Jhc2UucHk=) | `17.31% <ø> (-0.22%)` | :arrow_down: | | [pyplis/camera\_base\_info.py](https://app.codecov.io/gh/jgliss/pyplis/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F#diff-cHlwbGlzL2NhbWVyYV9iYXNlX2luZm8ucHk=) | `69.76% <ø> (+0.30%)` | :arrow_up: | | [pyplis/custom\_image\_import.py](https://app.codecov.io/gh/jgliss/pyplis/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F#diff-cHlwbGlzL2N1c3RvbV9pbWFnZV9pbXBvcnQucHk=) | `21.38% <ø> (-0.36%)` | :arrow_down: | | [pyplis/dataset.py](https://app.codecov.io/gh/jgliss/pyplis/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F#diff-cHlwbGlzL2RhdGFzZXQucHk=) | `54.08% <ø> (+0.21%)` | :arrow_up: | | [pyplis/fluxcalc.py](https://app.codecov.io/gh/jgliss/pyplis/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F#diff-cHlwbGlzL2ZsdXhjYWxjLnB5) | `16.45% <ø> (+0.01%)` | :arrow_up: | | [pyplis/forms.py](https://app.codecov.io/gh/jgliss/pyplis/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F#diff-cHlwbGlzL2Zvcm1zLnB5) | `35.39% <ø> (+0.57%)` | :arrow_up: | | [pyplis/geometry.py](https://app.codecov.io/gh/jgliss/pyplis/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F#diff-cHlwbGlzL2dlb21ldHJ5LnB5) | `48.11% <ø> (+0.06%)` | :arrow_up: | | [pyplis/inout.py](https://app.codecov.io/gh/jgliss/pyplis/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F#diff-cHlwbGlzL2lub3V0LnB5) | `26.38% <ø> (+0.29%)` | :arrow_up: | | [pyplis/model\_functions.py](https://app.codecov.io/gh/jgliss/pyplis/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F#diff-cHlwbGlzL21vZGVsX2Z1bmN0aW9ucy5weQ==) | `37.93% <ø> (-1.06%)` | :arrow_down: | | ... and [17 more](https://app.codecov.io/gh/jgliss/pyplis/pull/45?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F) | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/jgliss/pyplis/pull/45/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F)

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