Profile editor - Clarified which LEDs are part of the selected layer

Profile editor - Re-implemented LED dimming
Profile editor - Hide layer bounds of unselected layers
Profile editor - Dim layer shapes of unselected layers (option to hide them NYI)
Profile editor - Disable edit tool when no layer is selected or the selected layer has no LEDs
Gradient picker - Fixed the preview being at a slight angle
Color brush - Fixed the gradient being at a 45 degree angle
Settings - Added color scheme option to manually switch between light and dark

src/Artemis.UI/Screens/RootView.xaml

@@ -50,7 +50,7 @@
             </Style.Triggers>
         </Style>
     </mde:MaterialWindow.Resources>
-    <materialDesign:DialogHost Identifier="RootDialog">
+    <materialDesign:DialogHost Identifier="RootDialog" DialogTheme="Inherit">
             <materialDesign:DrawerHost IsLeftDrawerOpen="{Binding IsSidebarVisible}">
                 <materialDesign:DrawerHost.LeftDrawerContent>
                     <ContentControl s:View.Model="{Binding SidebarViewModel}" Width="220" ClipToBounds="False" />