Lots that can go wrong here, and most likely we'll want to redo how
selections work over time to use a drag gesture instead of the sort
of annoying click/motion stuff we're doing here.
Some minor changes were necessary so that we could change the ABI in
libsysprof-capture to be free from GLib (and therefore used by GLib).
This also adds some wrappers for capture API in libsysprof so that we
can continue to use GError from UI code.
This simplifies the visualizer sizing by avoiding the expanding sizes
when there is more space available. Doing so allows us to treat all the
sizing uniformly.
We can also make the ticks area a visualizer for more code re-use.
This comprises a massive rewrite of the UI for browsing captures. We use
the SysprofAid class to scan capture files for content and then auto-
matically add visualizers and details pages.
To avoid breaking things incrementally, we just land this as a very large
commit. Not necessarily ideal, but given the amount of stuff that could
break, this is easier.
As part of this process, we're removing a lot of the surface API so that
we can limit how much we need to maintain in terms of ABI.
