Added installing from kde Discover

Reverse removal of metadata.desktop file.
Still needed in some cases.

Update license link in About dialog.

Code fixes, improvements including
Remove "all" from Disk Space, Network, etc. due to inconsistant
data.
    Use Consistant unit sizes in tootips.
Ability to set command to be started for each item when
Left-Clicked.
Option to show CPU temperatures seperately or show maximum for all
cores.
    Added Sensors for CPU and GPU Frequencies.

Update ReadMe File.

Fix Version number in about panel

Update to Read me file

Added following Sensors.
    Cpu Temperatures
    Gpu Load
    Gpu memory
    Gpu Temperature

General code improvements.
Better Tooltip formating.
Added option to show peak values.

Change plotter smoothing strength

Revert plot history change, using too much CPU.

Rewritten to use new sensor API.
Improved plotter smoothing, doubled amount of plot history.