DSSL: Add update timestamp logic from DERSL
DSSL: Add font initialization logic
Start work on DSSL.renderSlides

Still basically copying from DERSL. The loop should be a lot simpler,
though. (Still, I have to handle ties of various sorts... but at least I
don't have to interface with an EventResults object.)
Add the remaining layout constants from DERSL to DSSL
DSSL: Add createNewSkeletalSlide

Slight modifications to fit the new use case.
DSSL: Skeletal slides get a spacer

This is because we won't be using result types like DERSL, so we need to
add the spacer here.
DSSL: Add forceAddList as well as renderSlides initialization logic
DSSL: Add checkTieLength
DSSL: Add forceAddTie
More DSSL.forceAddList logic (first tie addition)
Add DSSL.tryAddTie
DSSL: finish (hopefully) forceAddList
DSSL: Finish renderSlides

...I hope.