This adds a specific frame type for the Jitmap frames in the capture files.
You can iterate them without having to bswap as well, which is why this
does not use the SysprofCaptureJitmapIter (which does require bswap'd
frames).
This uses an augmented red-black tree to create an interval tree with
non-interval lookups. That amounts to storing address ranges within the
red-black tree, but looking up by single address.
This also indexes the first position of a file by filename so that we can
skip items in the capture file. Generally, embedded files are a single
frame so that will only be one frame to look at. But even when it is a
few frames, they are generally sequential so this vastly reduces how many
frames we'll need to look at for files.
The goal here is to break up libsysprof into a library for recording
profiles (using libsysprof-capture) and a library for analyzing profiles
(both used by the sysprof UI).
