GPII-549: "Full Editor" button in the PCP should save settings and switch to the PMT

This pull request is absolutely independent from https://github.com/GPII/prefsEditors/pull/23.

When https://github.com/GPII/prefsEditors/pull/23 gets in, there will be a tiny conflict in prefsEditor.js, regarding the name of the selector for "save" button. It's currently "saveAndApply", but IF there will be an "apply" button for webSockets communication to a local flowManager and a "save" button separately (as in https://github.com/GPII/prefsEditors/pull/23), the selector for the "save" button would be just "save" (for instance).