Governor Selecting

I’ve just committed the changes which add support to change the governor with the frequency selector. I didn’t know how to exactly add it, so finally I’ve chosen what I think it’s the less bad option.

CPUFreq Applet Preferences dialog
CPUFreq Applet Preferences dialog

Frequencies menu Governors menu Frequencies and governors menu
Frequencies menu Governors menu Frequencies and governors menu

Maybe the names of the governors are technical and difficult to understand for the users