Various improvements:
- Remove the log-scale in the graphs, it was confusing (and also broken, the legend was wrong).
- Rework the per-frame time to aggregate all threads, which is convenient now that things are threaded.
- Allow clicking on the history graph to update the zoom of the threads, which can be useful occasionally.
- Also make it so that in line-mode, we show both the smoothed and non-smoothed lines which is better for analysis.
- Minor refactoring of a few things.
- Some improvement to the Frequency Graph look / behaviour.