Make most files non-executable

Cosmetic, but makes things easier to see.
Begin .gitignore

Copied from cnijfilter-common with the binaries cleared initially.
Add printer-driver metapackage
Set shell to bash

The rules file uses pushd/popd, so we need to be running bash.
Update Build-Depends covering all tools and libraries
Convert to native debian package and drop release number

The source and debian packaging files are all mixed together and tracked
in git, so it's simplest to just make this a native package.
Ignore generated binaries and debian output
Bump local version for OBS build