[Feature Req] Revert asset to saved state

Similar to this request on the answer hub:

Sometimes I open an asset to check how it works or modify one value, but after doing so want to revert it back to its original state. Put another way, it would be nice to say ‘disregard changes and reload from disk’ for a single asset. Similar to how one would revert a source code file using SVN from the local changes back to the branch/trunk version. Currently doing so requires exiting the editor without saving that asset.

This is particularly true of tutorial content where I want to learn by experimentation, but wish to ensure the assets return to the reference standard on exit.