DEV: Renaming Classes and Functions

[vqdang]

Rename:

• FeatureExtractor to DeepFeatureExtractor
• CNNExtractor to CNNBackbone

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[codecov]

Codecov Report

Merging #226 (769a4bc) into develop (96ea2b1) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop     #226   +/-   ##
========================================
  Coverage    99.81%   99.81%           
========================================
  Files           53       53           
  Lines         4867     4867           
  Branches       800      800           
========================================
  Hits          4858     4858           
  Misses           2        2           
  Partials         7        7           

Impacted Files	Coverage Δ
tiatoolbox/models/__init__.py	100.00% <ø> (ø)
tiatoolbox/models/architecture/__init__.py	100.00% <100.00%> (ø)
tiatoolbox/models/architecture/vanilla.py	100.00% <100.00%> (ø)
tiatoolbox/models/engine/semantic_segmentor.py	100.00% <100.00%> (ø)

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[shaneahmed]

Thanks @vqdang