Rename "XXXbase" to "XXXBase"

[tky823]

Summary

By this PR, all of XXXbase class is renamed to XXXBase. This change is based on the Python style guide.

close #223

[codecov-commenter]

Codecov Report

Base: 94.66% // Head: 94.66% // No change to project coverage 👍

Coverage data is based on head (197b424) compared to base (db9cac0).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #224   +/-   ##
=======================================
  Coverage   94.66%   94.66%           
=======================================
  Files          38       38           
  Lines        4573     4573           
=======================================
  Hits         4329     4329           
  Misses        244      244           

Impacted Files	Coverage Δ
ssspy/bss/cacgmm.py	92.06% <100.00%> (ø)
ssspy/bss/fdica.py	92.50% <100.00%> (ø)
ssspy/bss/ica.py	92.79% <100.00%> (ø)
ssspy/bss/ilrma.py	96.91% <100.00%> (ø)
ssspy/bss/ipsdta.py	89.71% <100.00%> (ø)
ssspy/bss/iva.py	96.20% <100.00%> (ø)
ssspy/bss/mnmf.py	95.62% <100.00%> (ø)
ssspy/bss/pdsbss.py	95.00% <100.00%> (ø)

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