Undo PokeCodec's PRs

This commit undoes most of PokeCodec's PRs after the debate in chat. Some
harmless or completely superseded PRs have been left alone, as there is not
much benefit in attempting to undo them.

Reverts #1104, #1108, #1115, #1118, #1119, #1124, #1126, #1127, #1132, #1136,
#1137, #1139, #1140, #1144, #1148, #1149, #1150, #1153, #1155, #1177, #1179,
#1180, #1181, #1182 and #1183.

src/pokemon_animation.c

@@ -2884,10 +2884,13 @@ static void sub_8181C2C(struct Sprite *sprite)
     }
     else
     {
+        #ifndef NONMATCHING
+            register s32 var asm("r4") = sUnknown_03001240[sprite->data[0]].field_8;
+        #else
+            s32 var = sUnknown_03001240[sprite->data[0]].field_8;
+        #endif
 
-        const s16 var = sUnknown_03001240[sprite->data[0]].field_8;
-
-        sprite->pos2.x = var * ((counter % 128) * 8) / 128 + 8 * -var; //Should be - 8 * var instead of + 8 * -var, but that doesn't match
+        sprite->pos2.x = (var << 3) * (counter % 128) / 128 - (sUnknown_03001240[sprite->data[0]].field_8 * 8);
         sprite->pos2.y = -(Sin(counter % 128, 8));
     }