chore: Updated all License references to aGPLv3

[frgfm]

As per #90, this PR introduces the following modifications:

• updates the LICENSE file by keeping only the aGPLv3 license
• updated references to license in README
• updated all copyright & license headers in Python files

Successfully merging this PR will close #90

Any feedback is welcome!

[codecov]

Codecov Report

Merging #95 (234d5a9) into master (400a69b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #95   +/-   ##
=======================================
  Coverage   86.42%   86.42%           
=======================================
  Files          21       21           
  Lines         869      869           
=======================================
  Hits          751      751           
  Misses        118      118           

Flag	Coverage Δ
unittests	86.42% <ø> (ø)

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

Impacted Files	Coverage Δ
pyrovision/datasets/__init__.py	100.00% <ø> (ø)
pyrovision/datasets/openfire.py	90.90% <ø> (ø)
pyrovision/datasets/utils.py	91.66% <ø> (ø)
pyrovision/datasets/wildfire/__init__.py	100.00% <ø> (ø)
pyrovision/datasets/wildfire/fire_labeler.py	100.00% <ø> (ø)
pyrovision/datasets/wildfire/frame_extractor.py	100.00% <ø> (ø)
pyrovision/datasets/wildfire/split_strategy.py	97.29% <ø> (ø)
pyrovision/datasets/wildfire/wildfire.py	97.22% <ø> (ø)
pyrovision/models/__init__.py	100.00% <ø> (ø)
pyrovision/models/densenet.py	58.53% <ø> (ø)
... and 10 more

---

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[MateoLostanlen]

Thanks for this PR, All good on my side !

[Akilditu]

Thanks for the PR!

All good :)

[Akilditu]

Thanks !