[MRG] Type stubs for static type checking with mypy

[AlexanderFabisch]

TODO

• [x] plot_utils
• [x] rotations
• [x] transformations
• [x] visualizer
• [x] batch_rotations
• [x] camera
• [x] editor
• [x] trajectories
• [x] transform_manager
• [x] urdf

[codecov-commenter]

Codecov Report

Merging #128 (2af2795) into master (4642ce7) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #128   +/-   ##
=======================================
  Coverage   99.48%   99.48%           
=======================================
  Files          27       27           
  Lines        4286     4286           
  Branches      317      317           
=======================================
  Hits         4264     4264           
  Misses         13       13           
  Partials        9        9           

Impacted Files	Coverage Δ
pytransform3d/test/test_batch_rotations.py	100.00% <100.00%> (ø)
pytransform3d/test/test_rotations.py	100.00% <100.00%> (ø)
pytransform3d/test/test_trajectories.py	98.79% <100.00%> (ø)
pytransform3d/test/test_transformations.py	99.63% <100.00%> (-0.01%)	:arrow_down:
pytransform3d/transform_manager.py	99.09% <100.00%> (ø)
pytransform3d/urdf.py	100.00% <100.00%> (ø)

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