Allow per-mare time limits in NiGHTS

This adds the level header parameter NightsTime, which allows setting mare-specific time limits. It takes a comma-separated list of numbers, similar to the Grades# parameter. If a mare's time limit is set to 0 with this parameter (which is the default case), it will be taken from the Ideya Drone as usual.

Example: NightsTime = 100,120,80 will set the time limits for mare 1, 2 and 3 to 100, 120 and 80 seconds respectively.

added Enhancement label

added 237 commits

• 48a8043c...a68440c4 - 236 commits from branch next
• a485dee8 - Merge branch 'next' into maretimers

Compare with previous version

added Unmergeable label

added 637 commits

• a485dee8...c91fc082 - 635 commits from branch next
• 8f2f70ae - Merge branch 'next' into maretimers
• 1aea6f8f - Merge branch 'maretimers' of git.do.srb2.org:STJr/SRB2 into maretimers

Compare with previous version

removed Unmergeable label

added 301 commits

• 1aea6f8f...72a6ad80 - 300 commits from branch next
• 6768bc71 - Merge branch 'next' into maretimers

Compare with previous version

added 63 commits

• 6768bc71...cf7adfc8 - 62 commits from branch next
• 261e2d43 - bruh

Compare with previous version

added 1 commit

• fdb23298 - fix spacing that gitlab freaked out over

Compare with previous version

added small label

requested review from @LoganAir

changed milestone to %2.2.14

merged

mentioned in commit a3165cbb