Protocol updates according to feedbacks

- Split filters into query and filters
- Add filters in endpoints query
- Alpha/test endpoint for timegraph navigation
- Add delete parameters for traces
- Indexing status for experiment
- Fixed XY that work only for common x axis
- Fixed tooltips for XY
- Add CSS class for timegraph and XY
- Add CSS endpoint

Signed-off-by: Simon Delisle <simon.delisle@ericsson.com>