Toss in support for a "step mode" curve (unfinished atm) and use it to
plot from the `volume` field of the ohlcv shm array (if available).
changes to make it happen,
- dynamically generate the fsp sidepane form from an input config `dict`
|_ dynamically generate the underlying `pydantic` model
|_
- add a "volume checker" helper func that inspects the shm array
- toss in sidepane resize calls to avoid race where the ohlcv array
is plotted too slowly compared to the volume and the chart somehow
doesn't show..
- drop duplicate rsi2 cruft (previously used to test plots of the shm
data)
fa9eebab35