Added IntelliJ ignores & reformatted header.
Added IntelliJ ignores & reformatted header.

fvillalba/gst-foundation,amai/gst-foundation,dolfdijkstra/gst-foundation,fvillalba/gst-foundation,amai/gst-foundation,dolfdijkstra/gst-foundation,fvillalba/gst-foundation,dolfdijkstra/gst-foundation,amai/gst-foundation