This creates a checkbox that allows the user to hide 2D matplotlib axis. Allows to hide/show axis to included when exporting as script. Also adds test for hiding the axis and exporting.

For issue #1883

Codecov Report

Merging #2128 into master will increase coverage by 0.10%. The diff coverage is 98.03%.

@@            Coverage Diff             @@
##           master    #2128      +/-   ##
==========================================
+ Coverage   87.86%   87.96%   +0.10%     
==========================================
  Files         246      246              
  Lines       22708    22726      +18     
==========================================
+ Hits        19952    19991      +39     
+ Misses       2756     2735      -21     

Impacted Files	Coverage Δ
glue/viewers/image/viewer.py	93.58% <85.71%> (+0.87%)	:arrow_up:
glue/viewers/matplotlib/viewer.py	95.83% <97.50%> (+1.91%)	:arrow_up:
glue/viewers/histogram/qt/options_widget.py	87.09% <100.00%> (ø)
glue/viewers/image/qt/options_widget.py	84.00% <100.00%> (ø)
glue/viewers/matplotlib/mpl_axes.py	90.47% <100.00%> (+0.23%)	:arrow_up:
glue/viewers/matplotlib/state.py	99.39% <100.00%> (+9.20%)	:arrow_up:
glue/viewers/profile/qt/options_widget.py	100.00% <100.00%> (ø)
glue/viewers/scatter/qt/options_widget.py	89.74% <100.00%> (ø)
... and 3 more

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