Finds an existing font in the list or creates a new one (that is automatically added to the list).
See wx:font% for the list of possible values for family-or-font-id (as a family), style, and weight. For information about font ids, see wx:font-name-directory%.
See wx:font% for the list of possible values for family, style, and weight. See also wx:font-name-directory% about the possible values for face.