fix(content): handle special npc's better in combat, and other combat refactors

[tannerdino]

• refactors some combat scripts
• remove custom opnpc2 and apnpc2 triggers for count draynor and delrith. Move these to ~npc_is_attackable to allow p_aprange calculations to run.
• removes 0 hp check for magic and cannoning (these dont exist in osrs!)
• adds cannon quest req to place cannons
• heal black knight titan and sir mordred from their death instead of being attacked at 0 hp
• shadow spiders drain prayer when they retaliate
• reset autocast when out of runes, if trying to attack with your autocast spell (matches osrs)
• move garlic behavior to count count draynor's attack script and retaliate script