Add comprehensive build script and fix quality issues

- Add build-all.sh for complete build process
- Add icons.ico for Windows (needs rcedit for embedding)
- Add tickstales.desktop for Linux menu integration
- Configure packr to use icons.icns for macOS
- Copy icons and version metadata in build script
- Linux build now includes .desktop file and icon

desktop/build-osx.json

@@ -6,6 +6,7 @@
     "classpath": ["target/advent-standalone.jar"],
     "mainclass": "advent.core.desktop_launcher",
     "resources": ["resources/icon", "steam_appid.txt"],
+    "icon": "icons.icns",
     "output": "target/osx/Tick's Tales.app",
     "bundle": "com.tickstales.upallknight",
     "verbose": true