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harmless or completely superseded PRs have been left alone, as there is not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.

include/pokemon.h

@@ -123,12 +123,12 @@ struct Pokemon
 
 struct Unknown_806F160_Struct
 {
-    u32 field_0_0:4;
-    u32 field_0_1:4;
-    u32 field_1:8;
-    u16 magic:8;
-    u32 size:4;
-    u16 field_3_1:4;
+    u8 field_0_0:4;
+    u8 field_0_1:4;
+    u8 field_1;
+    u8 magic;
+    u8 field_3_0:4;
+    u8 field_3_1:4;
     void *bytes;
     u8 **byteArrays;
     struct SpriteTemplate *templates;