Mark Math-specific functions in core as deprecated

The math specific functions in core are not needed
anymore and should be removed in future versions.
Math can access these settings in the same way as
all other extensions do.

Since Math 2.0 the rendered element has the property
"markerType" => 'nowiki'

Change-Id: I20d3714bed9da864146f133a08cf4ca90eda42ab
(cherry picked from commit 545b712ed4f1a3ac92699dec27414b2850430a64)