Add VRAM percentage sensors!

Beck Thompsonrequested to merge
beckthompson/ksystemstats:gpu-vram-percentage-sensors into master

Normal RAM had percentage sensors for how full it was, this adds a similar sensor to VRAM so they match!

A couple things to note:

1.) I'm unsure if I should add the same percentage sensor to the `LinuxAmdGpu.cpp` file

2.) I can also add the "free percentage" and associated sensors as well! Ram has these, but currently the VRAM only has "GPU Used Memory". I feel like it should probably have all the same sensors 🤔

Example of it working:

used_percent_kstatsviewer_example.png

Before what I had to do (ugly!):

BEFORE.png

Now what I can do (beautiful!):

AFTER.png

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