More tweaks to the random event set

Fixed the excessive amount of mudraptors spawning due to an oversight, mudbouncer ragdoll size and behaviour adjsutments

Small fixes and adjustments to the random events

-New Random events. i felt that the old random events were uninspired, Xan Monsters 2 creatures alone arent able to cover enough roles to make a challenging event set, for this reason ill probably scrap the idea of a separate third volume and instead add the planned creatures here once i feel like they are ready, this way i can also concentrate on refining a single creature before adding them in instead of hastily putting together a Creature pack with varying degrees of quality.
The new random event set features: mixed creature, both vanilla and xan Monsters 2 creatures spawn;
Biome specific event sets for campaign.
A more varied spawn pool
Cave spawns
(xan monsters 1 will get a similar random event overhaul later)
-Changed a bit the Observer sprite,
-changed The Scavenger identification name to make it compatible with the SOMA mod

FIxed oversight from previous update, reduced missions rewards

Small capitalisation fix for xml, temporarely removed Immortal's Mission

added a small monetary reward to the scavenger mission, since only being able to sell their loot to get a profit wasnt a good idea from my part

Updated observer with "observe" behaviour, scavenger now uses the new flee timers, brute flora correctly uses ladders

Ragdoll adjustments to observer

fixed lionthrsher crashing with harppons, gave it a swim bladder dop