Add RuntimeOptions.isMonochrome(), rm Runtime factory methods

Add RuntimeOptions.isMonochorme(), since commit 65f3bd6 on the master
branch change RuntimeOptions to have private fields and getters.

Basically revert commit c8feb10. Since the new android support on the
master banch sends backends to the Runtime constructor, which
previously only was done in tests, the change to use factory methods in
Runtime no longer make sence.