qapitrace: opening ubjson with state

[stgatilov]

qapitrace has very nice GUI for viewing GL state. However, it can be launched only by replaying a trace on local machine.

I am trying to analyze an issue happening on player's machine, so I ask him to produce ubjson file with glretrace and download it for inspection. It would be great if I could open this state ubsjon in qapitrace and inspect it visually.

[stgatilov]

I guess the same applies to json of a state, maybe json is even better.