In the first pass I add a `register` method and update `defineComponent`
so it calls `register` as well. This made it possible to create a
proof-of-concept for registered classes. Additionally ExportService was
added to expose registered classes to service scripts. This first pass
works, but it would be better if all types of classes (components or
otherwise) were registered via the same method.
Most of the time, we'll already have a TaskManagerRow for the given
process, so we can just update its properties.
Iterating the results from #iter_tasks means we also insert the rows in
the correct order, regardless of their previous order.
This currently behaves the same as it did before: It still recreates the
table contents every half a second. It should also look identical,
though it's possible I missed some small differences.
The component structure is:
TaskManagerTable
- Table
- TaskManagerRow
- TaskManagerRow
- TaskManagerRow
- ...
TaskManagerRow is implemented so that we can later move to modifying
them in place as the process tree changes, instead of having to replace
them all.
Otherwise, most of the code is just moved around, and not changed much.
