Nikola/camera poses

[NikolaJov96]

Added:

• Camera pose exporting to a CSV file
• Saving widget parameters to be restored when opening the project the next time

Closes #5 Closes #12

[NikolaJov96]

Could you include a downsampling parameter (every N-th frame) as well, I believe we'll need it right away?

Is that different from setting the framerate to a very low value inside the level sequence?