Remove raw trace output

Created by: credp

In the quest to speed up trappy parsing, I noticed that we can use the -r option for trace-cmd report so that we can use per-event raw parsing instead of generating a whole new text file.

This set of patches slightly alters the initialisation of parse objects so that we can have the set of events to use ready before we create the file, and then scans them to find which need raw formatting or not.

Then I use that to generate a single file. The patches look a little scrappy, but it works for me using the trappy example trace.