Another Rigol Controller Update

Sorry it’s been a little while since the last update!  I switched the screen capture from PNG to BMP which sped it up from almost 3.5s per click to under .5s per click.  The bottleneck is the scope, which takes some time changing the format.  BMP8 is by far the fastest of the scope picture formats, so that’s what I’m using.  I added the ability to record and playback a trace, and even a button to save the screen capture!  You can find it at my Framagit repo.