Random Checkpoints- Dynamic AI

Added config:
- m_fSpawnApartMinDist (default 300m, up from 200m hardcoded)
- m_fSpawnHQMinDist (default 400m)
- m_fSpawnInterval (default 120s)
- m_fEmptyVehicleClearRadius (default 30m)
- m_fEmptyVehicleCharacterSafeDist (default 60m)

Changed defaults:
- m_iMaxActiveCheckpoints (reduced to 6, for performance)
- m_fSpawnMinDist (reduced to 400m, given HQ safezone)
- m_fSpawnMaxDist (reduced to 1000m, squad may not spawn further)
- m_fDespawnDist (increased to 2500m, for persistence)

Other changes:
- Added check for lone vehicle spawning (still present when reloading save, or too far from players)
- Added registration of all checkpoints created during session (not just active ones) to reduce double-ups (still happens when reloading save)
- Vehicle pool limited to UAZs (avoids unwanted types and seems more plausible for them to randomly pop up)

Random Checkpoints Tweak

Min dist between checkpoints & re/spawn interval now configurable. Added min dist from HQ. Added preventions for lone vehicles. UAZs only.

Random Checkpoints Tweak

1.0.15

1.0.14

1.0.13

1.0.12

1.0.11

1.0.10

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1.0.0