Adaptive light-dark color scheme plugin

Jamie Murphyrequested to merge
wip/jamie/colour-scheme into main

Support Light-Dark colour scheme scheduling (inc. manual scheduling and sunrise-sunset)

Notable Changes:

  • Created new ColorScheme plugin to handle colour schemes
  • Moved gnome-datetime-source and gsd-night-light-common to the Common plugin (for shared use between color and theme plugins)
  • Added ScreenTransition method to GsdShell.

Fixes: #788

Related: gnome-control-center#2060, gnome-control-center!3099, gnome-shell!3406

Edited by Jamie Murphy

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