plotIndiv, plotVar need to be shorter!

Currently the plotVar function is 1,600 lines long!

need to break it into several little functions
may need to create a function to check the input arguments (so far, unsuccessful)
in plotIndiv we could also put the ellipse plot (see earlier issue)
and since this is a plotIndiv issue, we could code the s.match as an S3 function for pls, spls, rcc, sgcca, rgcca (see examples from mixOmics workshop) and rename that function plotIndivArrow (see earlier issue)

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