Toggles the usage / spawning of spells and spellbook effects
sm_spells_enabled <0/1> Default: 1 Setting this to value to 1 or higher enables spells. 0 Disables them.
This disables spawning of the tf_spell_pickup entity (which is spawned on map start / between rounds). And disables CTFSpellBook::RollNewSpell in all instances.
Note: Linux only, someone can find the offset for Windows or maybe someday I'll setup the tools to do so myself.