custom widgets: rework colors and cleanup

Use ColorData for custom widget themes to
make it more readable and consistent.

Renamed and split out colors to be more accurately
named and representative of how they are used.

Fixed a number of inconsistencies in how colors
were used across widgets.

Change-Id: I1cbb5f19223bd55107379b049beccaf1de4e26b2

vcl/headless/CustomWidgetDraw.cxx

@@ -334,7 +334,7 @@ bool CustomWidgetDraw::updateSettings(AllSettings& rSettings)
         aStyleSet.SetDialogTextColor(aStyle.maDialogTextColor);
         aStyleSet.SetWorkspaceColor(Color(0xDF, 0xDF, 0xDE));
         aStyleSet.SetMonoColor(Color(COL_BLACK));
-        aStyleSet.SetFieldColor(Color(COL_WHITE));
+        aStyleSet.SetFieldColor(Color(aStyle.maFaceColor));
         aStyleSet.SetFieldTextColor(Color(COL_BLACK));
         aStyleSet.SetFieldRolloverTextColor(Color(COL_BLACK));
         aStyleSet.SetActiveColor(Color(COL_BLUE));
@@ -349,10 +349,10 @@ bool CustomWidgetDraw::updateSettings(AllSettings& rSettings)
         aStyleSet.SetMenuBorderColor(Color(COL_LIGHTGRAY));
         aStyleSet.SetMenuTextColor(Color(COL_BLACK));
         aStyleSet.SetMenuBarTextColor(Color(COL_BLACK));
-        aStyleSet.SetMenuBarRolloverTextColor(Color(COL_WHITE));
-        aStyleSet.SetMenuBarHighlightTextColor(Color(COL_WHITE));
+        aStyleSet.SetMenuBarRolloverTextColor(Color(COL_BLACK));
+        aStyleSet.SetMenuBarHighlightTextColor(Color(COL_BLACK));
         aStyleSet.SetMenuHighlightColor(aStyle.maHighlightColor);
-        aStyleSet.SetMenuHighlightTextColor(Color(COL_WHITE));
+        aStyleSet.SetMenuHighlightTextColor(Color(COL_BLACK));
         aStyleSet.SetHighlightColor(aStyle.maHighlightColor);
         aStyleSet.SetHighlightTextColor(aStyle.maHighlightTextColor);
         aStyleSet.SetActiveTabColor(aStyle.maActiveTabColor);