RPL Disp Settings in Model File: Preparation: Encapsulating RplDisplaySettings
Bug Number: n/a
Release notes (y/n): no (not this detail)
For Release Nums: 7.1

Task: "Move the RPL display settings from the user-account configuration 
(registry) into the model file".  (This is one part of USACE-SWD 14).

Some project reference images and data files:
  http://cadswes2.colorado.edu/~philw/2017/CoeSwd14/Ref/RplDisplaySettings.png
  http://cadswes2.colorado.edu/~philw/2017/CoeSwd14/Ref/RplLayoutDlg-Registry-reg.txt
  http://cadswes2.colorado.edu/~philw/2017/CoeSwd14/Ref/ExportRplDisplaySettings.txt

This commit is preparation for this change.  There are no functional changes.
The relevant configuration data had been spread between the RplDlgMgr (font 
and color) and RplDisplaySettingsDlg (a dialog class! -- LineBreak objects).
The latter was quite something -- we won't want the Sim library reaching up 
into an actual dialog class for that data. [I did discuss these issues with 
Patrick].

This commit adds this new POD class:  QtRpl/RplDisplaySettings.
(I decided against putting it in the Rpl library because it depends on 
VisualToken).  This takes over the management of the LineBreak objects, 
as well as the RPL "Text" colors and RPL Font.  The header comment is 
copied below.

Also changed: The Rpl ColorType enumerated type was moved from 
RplDisplaySettingsDlg to the Rpl namespace (defined in Rpl/RplTypes).

//------------------------------------------------------------------------
// $Id: QtRpl/RplDisplaySettings.hpp 2017/04/13 14:31:34 philw $
// RPL Display Settings Data: Font / LineBreaks / RPL Text Colors [RW 7.1]
//------------------------------------------------------------------------
//
//  class RplDisplaySettings
//
//  This class encapsulates the following three sorts of configurable
//  global RPL settings:
//
//    (1) RPL Frame User Font
//    (2) RPL "Text Colors" (but not just text colors)
//    (3) RPL LineBreak objects.
//
//  A single instance of this class lives in QtRpl/RplDlgMgr.
//
//  This class provides the following capabilities:
//    (1) Applying Factory Default LineBreaks and Colors.
//    (2) User Account Based Persistence (registry)
//    (3) Old (non-XML) Legacy File Export/Import (doesn't include colors).
//    (4) New (XML) Serialization (used for model-based persistence
//         and New File Export/Import. [TO DO -- Phil, 4-13-2017].
//---