menu: Measurement data, new GUI

[lukasc-ubc]

Created a new menu: Measurement Data. Fetch data from GitHub and plot. Working on OSX/Windows, but presently only downloads the files and opens the PDFs.

Need a GUI to:

• filter by fabrication foundry, etc.
• select files: ctrl-click to select multiple ones (e.g., device fabricated several times, resulting in an overlaid plot)
• plot using INTERCONNECT (or directly in KLayout if possible)
• measurement versus simulation: simulate the selected opt_in and add to the plot