Release 1.7.0.6

Notable changes:
 2018-10-16 b9e842f7 actionless fix(packaging: arch): add 'gnome-themes-extra' dep for materia theme plugin
 2018-10-16 3dde2905 actionless chore(plugins: materia): update submodule
 2018-10-09 99ecab1a actionless chore(plugins: oomox): update submodule
 2018-10-08 7dc8f6d3 actionless chore(colors): add new colorthemes