Upgrade to rgbds 0.4.0

- fail for rgbds < 0.4.0
- `rst <Label>`
- `ds <count>, <byte>`
- `shift <N>`
- ASCII "\r"
- Sorted .sym file

tools/sort_symfile.sh

@@ -1,14 +0,0 @@
-#!/bin/sh
-TEMP_FILE=$(mktemp)
-sed \
-    -e "s/^..:[0-3]/0_ROM0@&/g" \
-    -e "s/^..:[4-7]/1_ROMX@&/g" \
-    -e "s/^..:[8-9]/2_VRAM@&/g" \
-    -e "s/^..:[A-Ba-b]/3_SRAM@&/g" \
-    -e "s/^00:[C-Dc-d]/4_WRAM0@&/g" \
-    -e "s/^..:[D-Dd-d]/5_WRAMX@&/g" \
-    -e "s/^..:[F-Ff-f]/6_HRAM@&/g" \
-    $1 \
-| sort \
-| sed -e "s/^.*@//g" > $TEMP_FILE
-mv $TEMP_FILE $1