## Description:
Small-island removal previously ran only on the full-size terrain. The
compact (4x downscaled) map inherited that filtering before being
downscaled, which meant islands that survived at full size could end up
as tiny specks in the compact map.
This PR runs `removeSmallIslands` on the 4x terrain as well, with half
the threshold (15 vs 30 tiles), so very small islands are pruned in
compact maps while the full-size map is unchanged.
## Please complete the following:
- [X] I have added screenshots for all UI updates
- [X] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [X] I have added relevant tests to the test directory
- [X] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
## Please put your Discord username so you can be contacted if a bug or
regression is found:
FloPinguin
## Description:
Add Nile Delta as a new regional map. Features 11 nations across the
delta region (Alexandria, Damietta, Faraskur, Sheremsah, El
Senbellawein, Aga, Mit Ghamr, Cairo, Heliopolis, Memphis, El Mansoura).
1.36M land tiles at 1556x1280, terrain generated from real relief data.
Includes the Suez Canal. Playlist frequency: 4.

## Checklist
- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
Source: https://commons.wikimedia.org/wiki/File:Niledelta_33.svg
Discord: gabigabogabu