A scenario correspond to a suite of action to execute on a pipeline,
for the time being, we only support seeking the pipeline, but in the
future we can imagine doing some queries, setting pipeline state, etc...
The scenario can be loaded thanks to the GST_QA_SCENARIO environment
variable, making it usable with any existant application, in case, the
application can be used interactively, the user should either, not load
any scenario or let the application run without interacting with it.
Remove error from GstQaErrorReport, making it only GstQaReport. Add
a level and use area and subarea code, with an extra string for message
adding details.
Provide macros on qa-monitor to make it easy to create reports.
