Really Big Update

Features:

• Added multiple chats support!
• Added Pango Markup support (bold, list, title, subtitle, monospace)
• Added autoscroll if the user is at the bottom of the chat
• Added support for multiple tags on a single model
• Added better model management dialog
• Added loading spinner when sending message
• Added notifications if app is not active and a model pull finishes
• Added new symbolic icon
• Added frame to message textview widget
• Fixed "code blocks shouldn't be editable"

Please report any errors to the issues page, thank you.