feat: implement plasma gun and rocket swarm mechanics along with various 3D asset imports

assets/weapons/ak47/source/license.txt

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+Model Information:
+* title:	Low-Poly AK-74
+* source:	https://sketchfab.com/3d-models/low-poly-ak-74-b27f9003622a4c7499bfd8d2a06dc47b
+* author:	TastyTony (https://sketchfab.com/TastyTony)
+
+Model License:
+* license type:	CC-BY-4.0 (http://creativecommons.org/licenses/by/4.0/)
+* requirements:	Author must be credited. Commercial use is allowed.
+
+If you use this 3D model in your project be sure to copy paste this credit wherever you share it:
+This work is based on "Low-Poly AK-74" (https://sketchfab.com/3d-models/low-poly-ak-74-b27f9003622a4c7499bfd8d2a06dc47b) by TastyTony (https://sketchfab.com/TastyTony) licensed under CC-BY-4.0 (http://creativecommons.org/licenses/by/4.0/)

assets/weapons/mortar/source/license.txt

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+Model Information:
+* title:	Modular Shotgun
+* source:	https://sketchfab.com/3d-models/modular-shotgun-5c04438b213648ea83007858e2b8c162
+* author:	Somersby (https://sketchfab.com/Somersby)
+
+Model License:
+* license type:	CC-BY-4.0 (http://creativecommons.org/licenses/by/4.0/)
+* requirements:	Author must be credited. Commercial use is allowed.
+
+If you use this 3D model in your project be sure to copy paste this credit wherever you share it:
+This work is based on "Modular Shotgun" (https://sketchfab.com/3d-models/modular-shotgun-5c04438b213648ea83007858e2b8c162) by Somersby (https://sketchfab.com/Somersby) licensed under CC-BY-4.0 (http://creativecommons.org/licenses/by/4.0/)