SFML-Cocoa is now part of the cmake-based examples

Removes Xcode project
Fixes a crash and
Silences system alerts in this example

examples/cocoa/resources/Cocoa-Info.plist

@@ -0,0 +1,34 @@
+<?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>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>cocoa</string>
+	<key>CFBundleIconFile</key>
+	<string>icon.icns</string>
+	<key>CFBundleIdentifier</key>
+	<string>org.sfml-dev.cocoa</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>cocoa</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSMinimumSystemVersion</key>
+	<string>10.6</string>
+	<key>NSHumanReadableCopyright</key>
+	<string>Copyright © 2007-2012 Marco Antognini and Laurent Gomila. Shared under zlib/libpng License.</string>
+	<key>NSMainNibFile</key>
+	<string>MainMenu</string>
+	<key>NSPrincipalClass</key>
+	<string>NSApplication</string>
+</dict>
+</plist>

examples/cocoa/resources/Credits.rtf

@@ -0,0 +1,7 @@
+{\rtf1\ansi\ansicpg1252\cocoartf1138\cocoasubrtf230
+{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
+{\colortbl;\red255\green255\blue255;}
+\paperw11900\paperh16840\vieww9600\viewh8400\viewkind0
+\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qj
+
+\f0\fs24 \cf0 See {\field{\*\fldinst{HYPERLINK "http://sfml-dev.org"}}{\fldrslt http://sfml-dev.org}} for more information}