Add a config file for export

[Addalin]

@scaperex
It is very essential to know what parameters were chosen in the GUI before doing export (from reconstruction tab).
can you try to write a config file that contains the following parameters:

• image type: hdr or jpg
• applied radiometric calibration: true or false
• ignore date extrinsic: true or false
• gamma correction: true or false
• path to ROI (if it was saved)