analog-nihil-dark,analog-nihil-light: add two watch faces

[turretkeeper]

Add a faithful recreation of the stylish clock widget design by Nothing, as seen here:

Comes in light and dark versions.

[FlorentRevest]

Sorry for the late reply! :)

Thank you for the contribution! Just a couple of comments:

• Nothing seems to be a trademark, could you remove references to their brand ? we prefer avoiding referring to other brands ;)
• Since you're not using any of the QtGraphicalEffects, those import QtGraphicalEffects 1.15 lines aren't necessary and should make the watchface loading a tad bit faster ;)

[turretkeeper]

Sorry for the late reply! :)

Thank you for the contribution! Just a couple of comments:

* Nothing seems to be a trademark, could you remove references to their brand ? we prefer avoiding referring to other brands ;)

* Since you're not using any of the QtGraphicalEffects, those `import QtGraphicalEffects 1.15` lines aren't necessary and should make the watchface loading a tad bit faster ;)

Addressed. analog-nothing is now analog-nihil, and the import is gone.