The source project of this merge request has been removed.
Remove modified-time and etag from ShumateTile
Now that map source chains are gone, ShumateNetworkTileSource communicates directly with ShumateFileCache. This means caching information no longer needs to be shuffled around in ShumateTile, so those properties can be removed.
Also made shumate_file_cache_get_tile_finish() provide the modification time.