Export raw data

[reilly-callaway]

Given the existing data source plugin support, it would be useful to manually export (presumably to a .csv) the raw data with timestamps.

For a single data variable (or maybe in the "view data" window):

Could consider exporting multiple variables.

[SchrodingersGat]

Definitely a good idea. Future work could include a "export plugin" system (similar to the still-yet-to-be-developed "import plugin") which would allow for custom export functionality.

But for now .csv is sufficient