Separate selection from color action scope

[jbunke]

Description

Turn ignore_selection into a flag like include_disabled_layers and remove it from DialogVals.Scope.

Tasks

• [x] Change color action implementations
• Layout changes
  • [x] Update DialogAssembly.makeCommonColorOperationElements with new flag
  • Shift index of following element down by one in each color operation dialog
  • [x] Palettize
  • [x] Extract to palette
  • [x] HSV shift
  • [x] Color script
• Update API
  • [x] Update node classes
  • [x] Update docs
  • [x] Document changes in API changes