Fixes an issue with the Mortarbug that was left in last moment, which would cause an error whenever it tried to range attack.

Uberbug
- This update also adds in the Uberbug. Basically the Uber Drone, Uberbugs are larger Drones that are slower, tankier and stronger. Alongside their fairly high health pool, they can regenerate health over time, indicated by small spore particles they emanate when doing so.
- Upon death, Uberbugs violently shake, emitting a bright light and spores before finally exploding into a moderately damaging poison explosion.

General
- More refined particle effects and behaviours made to look closer to the original game's.
- Cleaned out excess sounds and materials.
- Fixed some hitboxes to better suit the models.

Drones
- Now target func_door and func_door_rotating, instead of being limited to regular doors.
- Can smash through func_breakable objects like vent covers, windows or some walls.
- Uses pose parameters to look in the direction of their enemy.
- If an enemy is unreachable, they will attempt to leap to their position.
- Fire is more effective, causing them to slow down and constantly flinch, interrupting their attacks.
- When over 2000 units away from their enemy, Drones will make spooky ambient noises.

Harvesters
- Upon detecting an enemy, they will constantly create Xenomites regardless if they can directly see the enemy.

Mortarbugs
- Similar to Harvesters, Mortarbugs will constantly bombard an enemy from great distances regardless if they can directly see them.
- Can strafe after each shot.

Swarm Eggs
- No longer face their enemies, instead remaining stationary and facing a single direction when spawned.
- Slightly higher chance of spawning a parasite when approached.

Contains:
- All required resources. No need to install and mount Alien Swarm.
- Drone, Carrier Drone, Summoner Drone, Ranger, Shieldbug, Boomer, Mortarbug, Buzzer, Harvester, Xenomite, Parasite, Antlion Guard.
- Rangers and Mortarbugs will spit projectiles in three different directions.
- Mortarbugs, Buzzers and Harvesters have acidic skin, damaging enemies who make contact.
- Shieldbugs move into defensive stance when close enough to an enemy, using their shield-like limbs to deflect incoming attacks.
- Shieldbugs will send their enemies flying upon killing them, potentially damaging anyone hit by their corpse.
- Drones can attack doors to break them after some time. Shieldbugs can instantly smash doors down.
- Harvesters, Mortarbugs and Rangers will attempt to back away from enemies who get too close, and will also run away from grenades.
- Parasites can infest players and NPCs. Infestation can be cured by wearing suit armor.
- Mortarbug projectiles will stick to walls and open up, detonating after a few seconds.
- Boomers will inflate once close enough to an enemy. When killed while inflated, they will release several cluster bombs into the vicinity.
- Xenomites only live for a short period of time after being birthed by a Harvester before automatically exploding.
- Carrier Drones drop Parasites when killed.
- Summoner Drones will call in two Drones and occasionally a Ranger every few seconds.
- Eggs can be set on fire, where they will panic, spew out a burning Parasite and die soon after. Parasites that are on fire are harmless and cannot attack.
- Attacking Drones and Rangers with energy-based damage will slow them down significantly, while setting them on fire will cause them to constantly flinch every second.
- Buzzers will cause the screen to shake heavily upon hitting a player.
- Bonus alien; the Facehugger. A Parasite which leaps onto the face of its host and instantly subdues it.
- Antlion Guards will charge at enemies and deal huge amounts of damage.
- Drones can climb most walls to reach their enemies.