canvas zIndex needs to be 2 so realtime graphs show the data lines
Add experiment graphing from multiple sensors on a labquest
initial diffusion across a permeable membrane

[#47225527]

This needs story https://www.pivotaltracker.com/story/show/47225527 to behave more like the original SAM activity. Not sure why the top elements are not aligned even though the div elements are aligned correctly.
auto-enable focus only on Interactive Browser

[#47570983]
restore Interactive Browser energy graph

TODO: needs to calculate correct sample rate via
data from iframe postMessage API