Rendering

Fix for the following issue

4. Extract the International Date Line from the Geographic Lines file.

The Geographic Lines file for each resolution in the Natural Earth Dataset contains the International Date Line (IDL) as well as the Tropical and Polar Circles and the Equator.
Difficulty: MEDIUM
We ONLY want to use the IDL since we can much more efficiently create the other lines inside our Coordinate Grid plugin. So this task is about extracting/importing the IDL into the tiles for each level as part of our natural earth tile build script.
For the styling a black line should be chosen.