Horizontally centered font rendering a bit.

Cannot move the vertical font centering from ToggleWidget to global
because ToggleWidget deals with numbers (i.e. upper case chars)
exclusively, while all other text has lower case which wants to be
raised. Both lower and upper case letters cannot be centered
simultaneously.
An idea to try would be to have upper case letters that increase
equally upwards and downwards (rather than upwards only). Perhaps this
is an issue because of line edges being visible.