:sparkles: Use Enums For Codec & Color Space

[John-P]

• Change compression kwarg to codec.
• Add Codec and ColorSpace enums.
• Remove normalise_colorspace and normalise_compression methods.
• Update tests

[codecov[bot]]

Codecov Report

Merging #9 (c42542f) into dev (91ea6df) will decrease coverage by 0.01%. The diff coverage is 83.33%.

@@            Coverage Diff             @@
##              dev       #9      +/-   ##
==========================================
- Coverage   87.82%   87.80%   -0.02%     
==========================================
  Files          11       12       +1     
  Lines        1191     1296     +105     
==========================================
+ Hits         1046     1138      +92     
- Misses        145      158      +13     

Impacted Files	Coverage Δ
wsic/cli.py	86.81% <ø> (ø)
wsic/utils.py	93.69% <ø> (+2.35%)	:arrow_up:
wsic/writers.py	85.44% <76.66%> (+0.49%)	:arrow_up:
wsic/enums.py	84.29% <84.29%> (ø)
wsic/readers.py	88.69% <100.00%> (+0.02%)	:arrow_up:

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