Renaming math stream objects

[Thibaut Cuvelier]

Dear list,

In https://www.lyx.org/trac/ticket/12055, there was some confusion about
the name of the streams used to output math: there is OctaveStream for
Octave, MathematicaStream for Mathematica, etc., but MathStream for MathML
(the name is much more generic than what the class does) and WriteStream
for standard LaTeX math (the name is unrelated to the features of the
class).

As proposed in the ticket, I attach two patches to rename these classes so
that their name is much more descriptive. Is it OK to push these commits?

Thibaut
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