The chemical and mathematical formula inspectors and dialogs
have a lot of similar functionality, and the common parts are
now moved to the common MWLatex class.
MWMath* classes now inherit from MWLatex*, and so do
the new MWChem* classes.
Bug: T153365
Change-Id: I4452ceca55197fda5f1e1293a5741c6f5fb7c245
Amire80