Debug command to log all asset conflicts

Having a command that dumps all asset conflicts into the log would be helpful to more easily narrow down some of the more difficult to diagnose issues, since they sometimes can't be reproduced on any other install.

Being able to run this after all assets loaded would also allow for more concise logs, which would make finding a particular conflict easier. For example, if there are three mods that all provide a file, there will be two conflict entries in the log; for the first and second mods, then the second and third mods.
Having all three mods already loaded would allow for them all to be logged in the same line.