Currently, only very basic measurements are supported - shaper+matrix profiles
only - but more advanced functionality will be added over time.

# Future plans (in no particular order)

- hide the cursor when it hovers over the color patch, to ensure it
doesn't interfere with measurements
- support more complex profiling strategies
- add some resolution vs. speed option?
- automatically figure out a good sampling speed. Right now it's
hardcoded at 2 samples per second, which is probably slower than
necessary
- support some profiling extension for niceties, like keeping the
surface always on top, inhibiting the previous ICC profile and
inhibiting night light
- integrate with KDE display settings, to automatically set the
profile for the output
- integrate with KWin's brightness control settings, to integrate
backlight information into the profile
- support some sort of profiling with HDR (possibly using
Microsoft's MHC2 tag for that)
- (maybe?) allow the user to "calibrate" the white point with the
VCGT tag. This should ideally be provided by the compositor, but
may be useful for those that don't support it
- add some measurement / calibration mode, where we just do
continuous measurements and show the result
- add a verification mode