Revised methods for title slides

Found we only had methods for some sizes, and didn't have a consistent way to
fiddle the formatting when you wanted *almost* that slide with a little
difference.

Also has a hacky vertical alignment that works ok for single lines of text.
Worth improving later, but gets it done for now.
With fiddling you mean resetting those constants? Seems good enough for now.. later on there might be configuration options toa void resetting constants