Added macOS .app instructions/scripts, Added icon for macOS (#88)

* Add macOS appgen instructions
Added instructions for generating a .app package for GModCEFCodecFix, as well as a directory to drop other documentation into.

* Create launcher.sh
Added launcher.sh, a proxy for running the Terminal version of GModCEFCodecFix inside of a .app package.

* Added appify.sh script for macOS
Generates a .app package from a shell script;
Source: https://gist.github.com/mathiasbynens/674099

* Added macOS compatible icon (.icns format)

docs/macOS/appgen.txt

@@ -0,0 +1,9 @@
+// To generate .app version, use the following process from the repository's root instead of the normal pyinstaller script. This method creates a .app release which we modify to our needs.
+
+pyinstaller --add-data version.txt:. --add-data LICENSE.txt:. --add-data README.md:. --onefile GModCEFCodecFix.py --windowed --icon=GModCEFCodecFixIcon.icns
+mv "./dist/GModCEFCodecFix.app/Contents/MacOS/GModCEFCodecFix" "./dist/GModCEFCodecFix.app/Contents/MacOS/GModCEFCodecFix-macOS"
+./docs/macOS/scripts/appify.sh ./docs/macOS/scripts/launcher.sh "GModCEFCodecFix"
+mv "./GModCEFCodecFix.app/Contents/MacOS/GModCEFCodecFix" "./dist/GModCEFCodecFix.app/Contents/MacOS/GModCEFCodecFix"
+rm -R "./dist/GModCEFCodecFix.app/Contents/_CodeSignature" && rm -R "./GModCEFCodecFix.app"
+
+// We've now created a functional .app package for GModCEFCodecFix located in "./dist/GModCEFCodecFix.app"

docs/macOS/scripts/appify.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+if [ "$1" = "-h" -o "$1" = "--help" -o -z "$1" ]; then cat <<EOF
+appify v3.0.1 for Mac OS X - http://mths.be/appify
+Creates the simplest possible Mac app from a shell script.
+Appify takes a shell script as its first argument:
+    `basename "$0"` my-script.sh
+Note that you cannot rename appified apps. If you want to give your app
+a custom name, use the second argument:
+    `basename "$0"` my-script.sh "My App"
+Copyright (c) Thomas Aylott <http://subtlegradient.com/>
+Modified by Mathias Bynens <http://mathiasbynens.be/>
+EOF
+exit; fi
+
+APPNAME=${2:-$(basename "$1" ".sh")}
+DIR="$APPNAME.app/Contents/MacOS"
+
+if [ -a "$APPNAME.app" ]; then
+	echo "$PWD/$APPNAME.app already exists :("
+	exit 1
+fi
+
+mkdir -p "$DIR"
+cp "$1" "$DIR/$APPNAME"
+chmod +x "$DIR/$APPNAME"
+
+echo "$PWD/$APPNAME.app"

docs/macOS/scripts/launcher.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+scriptPath=$(dirname "$0")'/GModCEFCodecFix-macOS'
+open -a Terminal "$scriptPath"