launch: Make it easier to render project
launch: Make it easier to render project

Now providing an output uri is enough to tell that you want to render.

It will use project rendering infos when possible, missing a way to
specify which info if various are disponnible (we use the first one
right now).

+ Make options more logical now, -l mean --load, and -r means repeat

pitivi/gst-editing-services,cfoch/ges,cfoch/ges,pitivi/gst-editing-services,pitivi/gst-editing-services,cfoch/gst-editing-services,pitivi/gst-editing-services,cfoch/gst-editing-services,cfoch/ges,cfoch/gst-editing-services,cfoch/gst-editing-services,cfoch/ges