Add create_dmg.sh script to create .dmg packages.

misc/create_dmg.sh

@@ -0,0 +1,22 @@
+#! /bin/sh
+
+dir="`pwd`"
+version=$(cat ../config.h | grep VERSION | sed -e 's/.*\"\(.*\)\"/\1/g')
+distdir=ASEPRITE_$version
+
+if [ ! -f $distdir.dmg ] ; then
+    cd "$dir/.."
+    mkdir "$dir/$distdir"
+    mkdir "$dir/$distdir/aseprite.app"
+    mkdir "$dir/$distdir/aseprite.app/Contents"
+    mkdir "$dir/$distdir/aseprite.app/Contents/MacOS"
+    mkdir "$dir/$distdir/aseprite.app/Contents/Resources"
+    cp -R LICENSE.txt docs "$dir/$distdir"
+    cp -R aseprite "$dir/$distdir/aseprite.app/Contents/MacOS"
+    cp -R "$dir/macosx/Info.plist" "$dir/$distdir/aseprite.app/Contents"
+    cp -R data "$dir/macosx/aseprite.icns" "$dir/$distdir/aseprite.app/Contents/Resources"
+    cd "$dir"
+
+    hdiutil create "$distdir.dmg" -srcfolder "$distdir"
+    rm -fr $distdir
+fi

misc/macosx/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDisplayName</key>
+	<string>ASEPRITE</string>
+	<key>CFBundleExecutable</key>
+	<string>aseprite</string>
+	<key>CFBundleIdentifier</key>
+	<string>org.aseprite.aseprite</string>
+	<key>CFBundleName</key>
+	<string>aseprite</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1.0</string>
+	<key>CFBundleIconFile</key>
+	<string>aseprite.icns</string>
+</dict>
+</plist>