Convenience features for tracing in rayx-ui

[ichinii]

fyi: tracing of batches is now asynchronous. For that reason, tracing can happen anytime in the background and the results can be rendered incrementally (the more batches are traced, the more rays can be rendered)

User story: Editing a beamline
current status: editing a beamline, does not trigger a trace. The user has to manually trigger a trace.
desired status: (live) automatic re-tracing while editing a beamline

• button for toggling automatic-tracing
• button for re-tracing (without opening trace configuration). (maybe hide/gray-out the button, if automatic tracing is enabled, or if the current trace is already up2date)
• in dialog "trace current file", change behavior when closing dialog. re-trace should not happen, if the current trace is up2date. rename "trace current file" -> something like "devices"

User story: need for quick results

• incrementally show trace results. After the first traced batch is ready, the rays can already be rendered. Accumulating traced rays, batch by batch