Update marker styles for tracks in plotters

[sdhiscocks]

• Use marker style for matplotlib plotter to signify state type, related to #695
• With plotly ensure that if custom marker provided, that it is not overwritten, and update documentation to reflect default

[codecov[bot]]

Codecov Report

Merging #705 (ba90f30) into main (0418c1b) will increase coverage by 0.01%. The diff coverage is 92.30%.

@@            Coverage Diff             @@
##             main     #705      +/-   ##
==========================================
+ Coverage   94.58%   94.60%   +0.01%     
==========================================
  Files         171      171              
  Lines        8794     8797       +3     
  Branches     1707     1706       -1     
==========================================
+ Hits         8318     8322       +4     
+ Misses        344      343       -1     
  Partials      132      132              

Flag	Coverage Δ
integration	70.39% <92.30%> (+0.06%)	:arrow_up:
unittests	90.73% <76.92%> (+<0.01%)	:arrow_up:

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Impacted Files	Coverage Δ
stonesoup/plotter.py	91.66% <92.30%> (+0.33%)	:arrow_up:

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