Make tooltip interactive.
The tooltip can display so much data that it is impossible to take it all in before it goes away when hovering over the applet. This change makes the tooltip interactive so that the user can actually read the data before it vanishes.
This change also restores the display of cached memory in the memory bar chart. These two changes restore the behavior of this applet before introducing Plasma required this new one.
Be sure to configure General->Monitor type->Compact bar and Colors->Set Colors Manually and probably General->Show->CPUs separately. The defaults are much less appealing.