Spawn away from enemy players

[tra]

This branch introduces 4 options for spawning which are controlled with the spawnOrder setting on the server:

• Random (0) = pick Incarnators randomly, probably not very useful but maybe interesting for some levels (?)
• Usage / Classic (1) = the same as what the original code did, pick the least-used Incarnators first, regardless of location
• Distance (2) = calculate the minimum distance to an opposing player and order on distance descending. There is also a random component added to this distance to keep it from being purely the furthest away. This is an improvement but can be a little too predictable on smaller levels.
• Hybrid (3) = combination of the above algorithms which takes into account both distance and usage. When comparing Incarnators this compares distancePlusRand/usageCount to decide which one to pick. This is the default option.