Makefile overhaul

Addition of a build directory, and more flexible to allow for possible blue build.

asmdiff.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+OBJDUMP="$DEVKITARM/bin/arm-none-eabi-objdump -D -bbinary -marmv4t -Mforce-thumb"
+OPTIONS="--start-address=$(($1)) --stop-address=$(($1 + $2))"
+$OBJDUMP $OPTIONS baserom.gba > baserom.dump
+$OBJDUMP $OPTIONS pmd_red.gba > pmd_red.dump
+diff -u baserom.dump pmd_red.dump | less