add multiple locations and subfolder option on media ingest presets

Currently, adding a subfolder to an ingest preset involves recreating the ingest path in full. I always use the same path for my ingest preset but need new folders for each media card. Just a simple addition of adding a subfolder without needing to create a new custom path would streamline the ingest process. Overall, ingesting through Media Encoder is the only way I can ingest to multiple locations at the same time and much better than needing a third app like Prelude (which I only ever used for ingesting). I like not having to create a prelude project just for ingest, but the ingest features need to be ported into Media Encoder for easier sending to multiple locations and creating subfolders.