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Defer matplotlib initialization for text rendering.

Allison Vacanti requested to merge allisonvacanti/vtk:15311-defer-mathtext-init into master

Rather than querying for matplotlib when vtkMatplotlibMathTextUtilities is constructed, check only when the library is needed. This saves some start up time for e.g. ParaView when mathtext is not used.

Some additional changes are required due to a change in behavior: vtkMatplotlibMathTextUtilities::New() used to return NULL when matplotlib was not found to signal that mathtext was unavailable. The vtkMathTextUtilities::IsAvailable() virtual method has been added to allow querying of the availability, now that New() can return a valid object when matplotlib is unavailable.

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