Eliminate Areas Requiring Crouching from NavMesh

[dwesterwick]

Some map prefabs like the children's play centers have features that are too low for bots to walk under, and they're too dumb to crouch. Instead, they think they can walk through the feature, but they actually just run up against it. BSG eliminates these areas from their meshes.

For example, this is BSG's NavMesh:

In contrast, this is Waypoints' NavMesh:

This is the result:

[DrakiaXYZ]

Updated meshes will be generated with a player height more in-line with what BSG uses (1.7m), which should resolve this. However I'll keep an eye on Streets when I generate that mesh