pickups, native build, enemy/bullet/stage overhaul

- Add pickup system (bomb, spread, rapid, shield) with new sprites
- Replace Docker build with native SGDK compile via m68k-elf-gcc
- Rework enemy spawning, homing math, boss HP/number globals
- Expand chrome: score popups, minimap, pause/game over improvements
- Overhaul stage generation with threat-point system
- Add explosion sprites, shield sprite, powerup sprite
- Add tools/ for sprite downscaling utilities

build.sh

@@ -1,7 +1,6 @@
-rm -rf res/resources.o res/resources.h out/*
-# make
-# ./blastem/blastem out.bin
-#dgen out.bin
-docker run --rm -v $PWD:/m68k -t registry.gitlab.com/doragasu/docker-sgdk:v2.11
-# /Applications/Genesis\ Plus.app/Contents/MacOS/Genesis\ Plus out/rom.bin
-/Applications/ares.app/Contents/MacOS/ares out/rom.bin --system "Mega Drive"
+#!/bin/bash
+set -e
+
+# Build and launch emulator
+./compile.sh
+/Applications/Genesis\ Plus.app/Contents/MacOS/Genesis\ Plus out/rom.bin