Added my Fedora COPR (experimental repo)

Today I tried to make SPEC file for slop.

I created a .spec file for slop and set up my COPR for building.  Also I
wrote [a script][1] that can produce the spec file and trigger new build from
sources at GitHub (my fork, for now):

  [1]: https://github.com/AloisMahdal/slop-copr-build

For now my plan is to keep an eye on new releases and re-run the script
manually (the script needs python-copr, which is only available at
Fedora AFAIK).

Should you consider providing "official" spec file, feel free to re-use
mine.

Re-add arrow key adjustment during drags (again)

Also check for an initialized keyboard, fixes #77

Add .gitignore file