Rename project to "Piwigo Remote Sync"

[olibre]

Using current language implementation is not relevant for this project.

• Name on piwigo.org = plugin Piwigo Remote Sync

Be inspired from Fotorama:

• Name on piwigo.org = plugin Fotorama
• Name on github.com : Piwigo-fotorama

The project is still at the beginning (13 commits) => renaming is still possible without much perturbation.

[plegall]

I agree, this would make things more readable