v3.1.0beta1 - Time to bring the others in!

• Fixes empty contact list when using the app with some Nc14 installations
• Switches everything to Nunito font
• Fixes text autocomplete on some phones
• Improves feedback when you try to type/paste a message longer than 1000 chars
• Adds support for file previews
• Adds support for starting a conversation with a group
• Adds initial support for a standalone signaling server