Fix typo in projectile class.

Refactor crossbow bolt entity into the generic projectile entity. Remove the crossbow bolt entity.

Add projectile impact decals using SWEP.ImpactDecal.

Fix SWEP.NumBullets not working with projectile weapons.

Add ConVar: "npc_weapons_force_animations". When enabled, forces NPCs to use the correct animations (force NPCs to hold pistols like pistols). This will NOT work without an addon that replaces NPC animations.

Major update:

Refactored rocket projectiles and generic projectiles into the same class.

Weapons can now be a "bullet" or "projectile" type. "Projectile" type weapons can be either explosive or non-explosive.

Coding no longer required for most projectile weapons, only changing configuration values around.

Added built in support for making rocket-firing weapons with configuration values.

Added a "be careful below this line" comment.

Added another debug display when using developer mode "developer 1" - purple cross at bullet impact position.

Added some very basic information on usage and how to use developer mode.