Remove One Path.jpg

It's released under the terms of the "Creative Commons Attribution-Noncommercial-No Derivative Works 3.0"
license which is not compatible with Fedora.

Issue: #3
Remove wallpapers whose license are not fine for Fedora

Issue: #3
Update credits for some wallpapers

Issue: #3
Rename files replacing space with underscore
Reorder files in CMakeLists.txt
More wallpapers

Add more wallpapers to replace the files we just removed.