added editorOverviewRuler and line number colors

[josefaidt]

Added

• editor: OverviewRuler - colors that appear in the area with the scrollbar trello card: b7SN0H4I
  • findMatchForeground - same as highlight
  • modifiedForeground - same as editorGutter
  • addedForeground - same as editorGutter
  • deletedForeground - transparent error color
  • errorForeground - same as editorGutter
  • infoForeground - same as info colors
• editor: Line number active foreground - brighter color of line number foreground trello card: UuRoc1D8
• editor: list error foreground - same color as editorGutter errors
• editor: list warning foreground - orange color used for syntactical methods
• editor: editorGroup.dropBackground - drag-n-drop color of tabs to editor panes, similar color to button hover backgrounds w/ 40% opacity

Changed

• editorSuggestWidget.selectedBackground - changed to #7580954d from #c6797e4d trello card: IrxvtriA