General Stability

To be fixed before 0.0.5:

• [x] Ensure navigation/combat is standard across all levels
• [x] Reduce memory usage, switch array dtype to 32bit (float32, int32), allocate resources on demand.
• [x] Clear bots on level reset.
• [x] Reduce behaviour cycle latency [try to query once for all bots]
• [x] DFAstar++ to prefer recorded (known) paths
• [x] Fix random crash on CQ (clone destination)
• [x] Load navmesh on level change