Enhancements for default Android Messaging

Change logs:

--- 08/14/2009
• Added setting for 'Always back to all-threads'
• customizable ScreenTimeout while reading/composing message
--- 08/08/2009
• MMS user-agent switcher from senab (revamped)
• Optizimed PNGs with optipng
• Rezipped for smaller apk size
--- 08/04/2009
• Changed Mms.apk version (not tested)
• New icon for "Append Signature" menu (need to be replaced)
• Fixed normal vibrate pattern
• Fixed incorrect LED colors: removed white, yellow is now orange
• Added custom LED color chooser with LED preview (LED will not display correctly if something else changing it, eg. phone is charging)
• Added LED blink rate customization
--- 08/02/2009
• Customizable Led/Vibrate notification. Vibrate patterns are from SMSPopup, if you need more configurable patterns please give SMSPopup a try
• Some tweaks in PreferenceScreen UI
--- 08/01/2009
• Signature/Auto-append signature
• .. and a little secret
--- 07/31/2009
• Black background
• Resize some icons
--- 07/25/2009
• Send on Enter