This is doing a bulk of the job of creating a service
for working with math modes configuration. There's
still things to do, like moving math mode names,
and perhaps depending on default user options to
provide a bit more convenience, but that will be the
next step.
Change-Id: I1259a93651920f44104f2f5135e3e620c858be8d
Some mentioned a "__constructor", which should be "__construct".
The leading backslash is not strictly needed by all tools. But some
need it. I learned it's best practice to always have it.
Change-Id: I22fe3a3b4828c02ab5a457aba9af5af1c72567ea
