Better use of geopandas in MapReader

[rwood-97]

Summary

At the moment MapReader doesn't make full use of geopandas. This PR addresses this and brings in geopandas wherever possible into the MapReader pipeline.

Fixes #436 Fixes #467

Describe your changes

• SEE CHANGELOG

• Checklist before assigning a reviewer (update as needed)

• [x] Self-review code

• [x] Ensure submission passes current tests

• [x] Add tests

• [x] Update relevant docs

• [x] Update changelog

Reviewer checklist

Please add anything you want reviewers to specifically focus/comment on.

• [ ] Everything looks ok?

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Codecov Report

Attention: Patch coverage is 91.28788% with 92 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
mapreader/download/sheet_downloader.py	79.38%	27 Missing :warning:
mapreader/spot_text/runner_base.py	0.00%	24 Missing :warning:
mapreader/spot_text/deepsolo_runner.py	0.00%	8 Missing :warning:
mapreader/spot_text/dptext_detr_runner.py	0.00%	8 Missing :warning:
mapreader/spot_text/maptext_runner.py	0.00%	8 Missing :warning:
tests/test_classify/test_datasets.py	94.11%	4 Missing :warning:
mapreader/classify/load_annotations.py	81.25%	3 Missing :warning:
mapreader/download/downloader.py	0.00%	3 Missing :warning:
mapreader/classify/datasets.py	93.33%	2 Missing :warning:
mapreader/load/images.py	98.36%	2 Missing :warning:
... and 2 more

Flag	Coverage Δ
unittests	68.56% <91.28%> (+2.52%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
mapreader/download/tile_merging.py	77.94% <100.00%> (+1.88%)	:arrow_up:
mapreader/process/occlusion_analysis.py	99.21% <100.00%> (-0.02%)	:arrow_down:
mapreader/utils/load_frames.py	100.00% <100.00%> (ø)
tests/test_annotate/test_annotator.py	100.00% <100.00%> (ø)
tests/test_classify/test_annotations_loader.py	100.00% <100.00%> (ø)
tests/test_download/test_sheet_downloader.py	99.77% <100.00%> (+<0.01%)	:arrow_up:
tests/test_load/test_images.py	100.00% <100.00%> (ø)
tests/test_load/test_images_load_parents.py	100.00% <100.00%> (ø)
tests/test_load/test_loader.py	100.00% <100.00%> (ø)
tests/test_load/test_loader_load_patches.py	100.00% <100.00%> (ø)
... and 15 more

... and 1 file with indirect coverage changes

[rwood-97]

@kallewesterling how do you feel if merge this? I feel pretty sure it won't break anything (and we can always revert to previous version if there is an issue) and will be helpful for the Oct workshop with visualising text outputs.