Improve delay handling with the static scheduler

[PeterJCLaw]

At the moment delays just don't do anything for the static scheduler.
One approach here might be to have the static scheduler default to relative times rather than absolute ones? That would allow easy configuration while still having a way for delays to apply.

[PeterJCLaw]

Another alternative would be to introduce a separate kind of knockout schedule, where the rounds/entrants/progression is defined statically but the times are computed automatically as they are for the league and the automatic scheduler.