Rename acDmgInfo.effect -> hitBacklash (#2555)

* CollisionCheckInfo.atHitEffect -> atHitBacklash

* ColliderElementDamageInfoAC.effect -> hitBacklash

* add HIT_BACKLASH_ enum

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* Update comments

include/collision_check.h

@@ -86,9 +86,14 @@ typedef struct ColliderElementDamageInfoAT {
     /* 0x05 */ u8 damage; // Damage
 } ColliderElementDamageInfoAT; // size = 0x08
 
+typedef enum HitBacklash {
+    HIT_BACKLASH_0,
+    HIT_BACKLASH_1 // Shock?
+} HitBacklash;
+
 typedef struct ColliderElementDamageInfoAC {
     /* 0x00 */ u32 dmgFlags; // Damage types that may affect this collider element as AC.
-    /* 0x04 */ u8 effect;  // Damage Effect (Knockback, Fire, etc.)
+    /* 0x04 */ u8 hitBacklash;  // The hit backlash type applied to any attacker hurting this AC collider.
     /* 0x05 */ u8 defense; // Damage Resistance
     /* 0x06 */ Vec3s hitPos; // Point of contact
 } ColliderElementDamageInfoAC; // size = 0x0C
@@ -465,7 +470,7 @@ typedef struct CollisionCheckInfo {
     /* 0x17 */ u8 health; // Note: some actors may use their own health variable instead of this one
     /* 0x18 */ u8 damage; // Amount to decrement health by
     /* 0x19 */ u8 damageReaction; // Stores what reaction should occur after being hit
-    /* 0x1A */ u8 atHitEffect; // Stores what effect should occur when AT connects with an AC
+    /* 0x1A */ u8 atHitBacklash; // Stores the hit backlash type received from attacking an AC collider
     /* 0x1B */ u8 acHitEffect; // Stores what effect should occur when AC is touched by an AT
 } CollisionCheckInfo; // size = 0x1C