Save and load 2D coordinates pre-normalization

[mrozycki]

Since we might want to implement better pre-normalization filters in the future (see #86 and #87), we might want to re-run the configurator with previously captured light positions to take advantage of the improved algorithm. Currently the points are saved post-normalization, which means normalization is not re-ran when using pre-captured points. Technically normalization can be reversed, but that would also have to be implemented, and saving coordinates pre-normalization is easier.

In the scope of this task, change the 2D coordinates to be saved before normalization, rather than after.