GPII-752: Add status messages to allow the user to know what's happening in the system

This pull requests adds status messages for:
 - Saving and thus logging in (PMT)
 - Loggint out in PMT
 - Saving and Applying in PCP
 - Making a change in the settings in PCP
 - Logging out from PCP

Currently, with this pull request the whole workflow of PMT & PCP is being described with short status messages.

It was decided in the comments of http://issues.gpii.net/browse/GPII-752 that the status messages will move along, in parallel with the functionality of both panels. Once another functionality part is added, the issue perhaps should be reopened to reflect the functionality improvement with another message.
@jobara this is an example way to add the `aria-controls` for the enabled switches in PCP. However, I was wondering if the prefsEditor component can somehow access selectors from auxShema adjuster entry objects like this https://github.com/radmanovi4/prefsEditors/blob/gpii-752/src/shared/schemas/js/pcpSchema.js#L103-L111. In specific, I was trying to reach a selector belonging to this component: https://github.com/radmanovi4/prefsEditors/blob/gpii-752/src/shared/schemas/js/pcpSchema.js#L106, which has the gradeName  `gpii.adjuster.onOffSwitch`, where the wanted selector is defined: https://github.com/radmanovi4/prefsEditors/blob/gpii-752/src/shared/adjusters/js/onOffSwitch.js#L24.

Can this be achieved through Infusion or do you suggest any better solution for this? Also, how can the prefsEditor component access the inputs for the radio buttons in the contrastTheme adjuster (for the same purpose - adding aria-controls attr)? I guess this is becoming rather complicated...