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harmless or completely superseded PRs have been left alone, as there is not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

berry_fix/asm/loader.s

@@ -109,7 +109,7 @@ _1a0:
 	strh r1, [r0, 0xa] @ SIOMLT_SEND
 	ldr r0, =_data_2f0
 	ldr r1, =gCode
-	svc 0x11 << 16
+	swi 0x11 << 16
 	ldr lr, =gCode
 	bx lr
 	.pool