Spawn request system refactor

[CarsonBurke]

• requests on made on demand based on priority, instead of doing all the calculations for all roles
• When spawns request skeletons are created in spawnRequester.ts, they add to room.spawnRequestSkeletons the opts they want for a real spawnRequest
• SpawnRequest class that converts spawnRequestSkeleton(s) into SpawnRequests
• While there are inactive spawns, use spawn requests, or if none convert spawn request skeletons into spawn requests, and try to spawn them