Small adjustments to rattlesnakes

[randomtyper]

Summary

None

Purpose of change

1. Giant serpents should not be hard to shoot;
2. IRL rattlers have a very good sense of smell (https://en.wikipedia.org/wiki/Vomeronasal_organ), while ingame ones do not for no reason;
3. Night vision radius for rattlers was quite small and not really realistically so (because of pit organs https://en.wikipedia.org/wiki/Infrared_sensing_in_snakes);
4. Size jump from giant rattler to deathrattle was a tad bit too big for my taste, deathrattle HP was low for size;
5. Deathrattles lacked body horror and abilities for the severity of their mutations;
6. Rattlers are not counted as animals for some reason;
7. Snakes can climb pretty damn well IRL, but can't in game;
8. Snakes do not avoid danger just like zombies, despite being living beings.

Describe the solution

Removed HARDTOSHOOT flag from deathrattle, added KEENNOSE to all rattlers. Increased night vision radius for all rattlers. Slightly decreased deathrattle size. Added slow regeneration (0.5%, 2 HP) to deathrattle, adjusted some descriptions. Confirm your kills, survivors.

Added some other flags to snakes like CLIMBS and AVOID_DANGER_1.

Describe alternatives you've considered

None

Testing

None for now

Additional context

None

[randomtyper]

@Karol1223, can you give this a go/request further changes?