Split lobby map preview into its own logic class.
Simplify the replay browser code.
Use MapPreview for server creation.
Integrate MapPreview into the map chooser.
Move C&C chrome definitions to more closely match the other mods.
Remove map download support.
Kick clients who don't have the map when the host force-starts.
Add a force start warning dialog.
Add data support to Download.
Implement async map downloads