Need to refactor schemas to better support Array and Object types.
We should probably better reify the axis/property concept and delegate to them to construct
the relevant bit of UI and link it with the data. Currently this is spread across path recorder,
scan.scan, and ExperimentPanel, which is manageable but as the complexity of what we allow on these
grows we should be better about this.
- Large file/memmap support, collect many data points synchronously against camera like instruments
- Stream directly to file