Improve interactive graph performance for large datasets

[giovannihenriksen]

• Improves interactive graph performance by downsampling the data.
• This can be tweaked in the add-on configurations

Currently, the downsampled data in the graph is lost, thus decreasing accuracy. In the future a feature could be implemented to take the averages of the omitted data for a more accurate representation.

For future reference: https://stackoverflow.com/questions/5162130/