Rink resurface board

Build the day's board for an ice rink: when each skating session really starts, given that the ice has to be resurfaced by the Zamboni as it wears out.

The rink opens at minute 0 with freshly resurfaced ice and closes at minute closing. sessions lists the sessions as [kind, start, length] in non-decreasing order of the requested start. Each session adds wear to the ice: length for "public" and "figure" sessions, and 2 * length for "hockey" sessions. Resurfacing resets the wear to 0 and takes resurfaceMinutes, during which the rink is closed to skaters.

Handle the sessions in order. For each one:

1. Resurfacing is needed if the ice has any wear (more than 0) and either the session is a "figure" session (figure skaters always want fresh ice), or the current wear plus this session's wear would exceed wearLimit. Landing exactly on the limit is fine. A session on fresh ice never needs resurfacing, even if its own wear is above the limit.
2. The Zamboni can only start when the previous session that actually ran has finished. So the earliest start is that session's end (0 if none), plus resurfaceMinutes if resurfacing is needed. The session starts at the later of its requested start and that earliest start.
3. The session is cancelled if it would start more than maxDelay minutes after its requested start, or if it would end (start plus length) after closing. Ending exactly at closing is fine. A cancelled session does not change anything: no resurfacing happens, no wear is added, and the next session sees the same previous end.
4. Otherwise the session runs: perform the resurfacing if it was needed, then add the session's wear.

Input: sessions, wearLimit, resurfaceMinutes, maxDelay, closing.

Output: a two-element list [starts, resurfacings]: starts has one entry per session in the given order, with its actual start minute, or -1 if it was cancelled; resurfacings is the number of resurfacings that were performed.