seaborn-image cmaps can now be set globally using set_image

[SarthakJariwala]

• set_image() function now also changes and registers seaborn-image colormaps
• default cmap is 'ice', set globally upon import
• Note : this will change the default for any matplotlib figure until reset_defaults()is called to set it to matplotlib default viridis. This can, of course, also be done using set_image(cmap="viridis")

Example:

isns.set_image(cmap="acton") # use seaborn-image colormaps
isns.set_iamge(cmap="viridis") # matplotlib colormaps work as usual

[codecov-commenter]

Codecov Report

Merging #15 into master will increase coverage by 0.80%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
+ Coverage   96.42%   97.23%   +0.80%     
==========================================
  Files           6        6              
  Lines         252      253       +1     
  Branches       52       51       -1     
==========================================
+ Hits          243      246       +3     
+ Misses          4        3       -1     
+ Partials        5        4       -1     

Impacted Files	Coverage Δ
src/seaborn_image/_context.py	97.87% <100.00%> (+4.53%)	⬆️
src/seaborn_image/_core.py	93.82% <100.00%> (-0.15%)	⬇️
src/seaborn_image/_general.py	100.00% <100.00%> (ø)

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