Enemy Collision Synchronized - v2.13.0

• A poll with nothing to inspect no longer re-reads every enemy or the clock, and a corpse that has needed no correction for about a second is re-checked progressively less often (at most 3-4 s apart) instead of on every visit. Measured in game: 0.036-0.047 to 0.021-0.022 ms per frame in missions, and 0.099 to 0.025 under heavy load.
• A settled ragdoll's motion check no longer makes Lua tables, with the same results: inspecting one allocates less Lua memory per poll (synthetic scene: 36.9 to 31.0 KB, and 33.4 to 29.5 KB in compiled code).