Changed model of FSD Overrun back to the original version due to issues with the entity.

Removed HL1 unused entities, as they were already implemented, just under a different name. Added icons for both FSD Overrun and Dynamic Supplies. Changed FSD Overrun model to cause less annoyance when spawning. Upgraded to the new addon system.

Rewrote all Lua scripts. Removed the ability to spawn Flechette Gun, Magnusson Device, Jalopy, Zombine, Uriah, and Antlion Worker without episodic and ep2 as they would show up as errors otherwise.

Added Uranium (Egon), MP5 Ammo [clip], MP5 Ammo[ar], and MP5 Grenade, but will only work if hl1 or hl1mp are mounted.

Initial addon creation.