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.
This will provide better namespacing for the objects inflated from the
document for various frame types. By creating real objects with real
properties we give ourselves quite a bit of flexibility in the data
filtering language coming forth.
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).
