fix(demonhunters): some spell definitions for Havoc Demon Hunters (#762)

* fix: reduce fury cost with first blood talent

* fix: blade dance and chaos strike are replaced during meta

src/scripts/ovale_demonhunter_spells.ts

@@ -278,6 +278,13 @@ Define(serrated_glaive_conduit 152)
     code += `
 Define(arcane_torrent 202719)
     SpellInfo(arcane_torrent cd=120 fury=-15)
+#blade_dance
+    SpellRequire(blade_dance fury add=-20 enabled=(hastalent(first_blood_talent)))
+    SpellRequire(blade_dance replaced_by set=death_sweep enabled=(buffpresent(metamorphosis_buff)))
+#chaos_strike_havoc
+    SpellRequire(chaos_strike_havoc replaced_by set=annihilation enabled=(buffpresent(metamorphosis_buff)))
+#death_sweep
+    SpellRequire(death_sweep fury add=-20 enabled=(hastalent(first_blood_talent)))
 Define(frailty_debuff 247456)
     SpellInfo(frailty_debuff duration=20)
 #spirit_bomb