Split lobby map preview into its own logic class.
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 bindings to ProgressBarWidget.
Reimplement ingame map downloading.
Use the resource site to fill in missing details in the server browser.
Update changelog.
Merge pull request #4901 from pchote/async-maps

Asynchronous map downloading.