Remove deprecated camelCase methods

[hugovk]

Remove deprecations from #49. To be released in a major version bump along with #50.

Will unblock #48.

TODO

• Merge Drop support for Python 3.6 #50 first to fix the CI status checks.

[codecov]

Codecov Report

Merging #51 (801238c) into main (48983b5) will decrease coverage by 0.70%.
The diff coverage is 29.16%.

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
- Coverage   56.52%   55.81%   -0.71%     
==========================================
  Files           4        4              
  Lines         552      430     -122     
==========================================
- Hits          312      240      -72     
+ Misses        240      190      -50     

Flag	Coverage Δ
GHA_Ubuntu	55.81% <29.16%> (-0.71%)	⬇️
GHA_macOS	55.81% <29.16%> (-0.71%)	⬇️

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Impacted Files	Coverage Δ
src/osmviz/animation.py	0.00% <0.00%> (ø)
test/unit/test_manager.py	100.00% <ø> (ø)
src/osmviz/manager.py	81.59% <87.50%> (-2.19%)	⬇️

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