omf: add install_bundle function

pkg/omf/cli/omf.install_bundle.fish

+function omf.install_bundle
+
+  if test -f $OMF_CONFIG/bundle
+    set packages (omf.list_local_packages)
+    set themes (omf.list_installed_themes)
+
+    for record in (cat $OMF_CONFIG/bundle)
+      set type (echo $record | cut -d' ' -f1)
+      set name (echo $record | cut -d' ' -f2- | sed -e 's/\.git//')
+
+      switch $type
+      case "package"
+        if not contains (basename $name) $packages
+          omf.install --pkg $name
+        end
+
+      case "theme"
+        if not contains (basename $name) $themes
+          omf.install --theme $name
+        end
+      end
+
+    end
+  end
+
+  return 0
+end