kcms/access: Move the Color Blindness Correction settings page to the Accessibility KCM
Part of systemsettings#39
This makes far more sense than having it in Desktop Effects, which is essentially an implementation detail which should be moved away from, especially for accessibility components.
This also slightly reorganises the page to make more sense within the context of the Accessibility KCM. It also adds some slider labels and sets a minimum value higher than 0, because for some reason in the KCM goes back to full intensity when set to 0, but not in the Desktop Effect configuration. Being able to set it to 0 is redundant anyway now that there's an enablement checkbox.
See also kwin!6317 (merged) which sets the corresponding Desktop Effect as internal.
FEATURE: 488771 FIXED-IN: 6.2.0
Edited by Nate Graham