RPL Viewer Prep [1]: Move RplBlock/FunctionDlg menus from UI into C++
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 5.2

This is one of two or three commits to prepare to deploy the full 
implementation of the RplBlockDlg and RplFunctionDlg as "tabs" in a new 
RplViewerDlg.  THIS commit deals with the problem that Qt Designer UI files 
provide a HARD-CODED deployment of the menubar content (QMenus and their 
QAction menu items).  This poses the following two problems:

(1) The full implementations of these two Rpl dialogs are being moved from 
    QMainWindow-based classes to QFrame-based classes.  Qt Designer (and the 
    generated UI files) support the definition of menus only for a 
    QMainWindow-based class.

(2) The RplViewerDlg will need to _dynamically_ install these menus when 
    switching between RplObj-based tabs (Blocks and Functions).  This isn't 
    only to account for the differences between RPL Blocks (Rules, Goals, 
    Methods) and RPL Functions.  It's also because we are trying to preserve 
    the _logical_ encapsulation around these implementations; we want "both 
    sides" of the Qt signal/slot connections from a menu's actions to the 
    QFrame-based class implementations to remain intact.

QMenu and menu QAction construction of the menus for these two dialogs was 
extracted from the UI files, and moved to these modules. (The process of 
doing this is further described below):

   QtRpl/RplBlockMenus.hpp
   QtRpl/RplBlockMenus.cpp
   QtRpl/RplFunctionMenus.hpp
   QtRpl/RplFunctionMenus.cpp

The "handles" (pointers) to the generated QMenu and QAction instances are 
made available as public data members in this class.  The two RPL dialogs 
dynamically instantiate an instance, and directly access those handles through 
a pointer to that instance.  This is similar to the coupling of the dialog 
class to the Qt Designer UI generated code.  For example, the RplBlockDlg now 
maintains these TWO pointers:

   Ui_RplBlockDlgWidgets* _ui;
   RplBlockMenus* _mu;

References to those QMenus and QActions within the dialog class need to 
change from "_ui-> ..." to "_mu->...".   (The dialog's _widgets_ are still 
accessed using the _ui pointer).

The following provides some information about the automated process used to 
change the appropriate "_ui" references to "_mu" references in the RplBlockDlg 
and RplFunctionDlg dialog classes.

The Qt 5.5.1 "uic" compiler translates Qt Designer UI files into C++ files.
The menu and widget layouts for RplBlockDlg and RplFunctionDlg are defined in 
these UI files:

   QtRpl/RplBlockDlgWidgets.ui
   QtRpl/RplFunctionDlgWidgets.ui

The generated C++ files (not in git source control) are:

   QtRpl/qt/ui_RplBlockDlgWidgets.h
   QtRpl/qt/ui_RplFunctionDlgWidgets.h

The following sequence of unix commands (making use of the "sed" utility) 
create a modified copy of RplBlockDlg.cpp. (An analogous set of commands was 
applied to RplFunctionDlg.cpp).  (I did this on our linux machine, Alamosa, 
but something like this would work also in a GIT MINGW64 command line window).

#----------------------------------------------
#  rm actions*
#  rm RplBlockDlg-MU.cpp
#
#  grep "addaction name=" RplBlockDlgWidgets.ui | grep -v separator > actions1.txt
#  sed 's|.*name=.\(_[A-Za-z0-9]*\).*|\1|' actions1.txt > actions2.txt
#
#  cp RplBlockDlg.cpp RplBlockDlg-MU.cpp
#  sed "s/\(.*\)/sed -i \'s|\\\(ui\\\)\\\( *-> *\\\)\\\(\1\\\)|mu\\2\\3|\' RplBlockDlg-MU.cpp/" actions2.txt > actionsSedCmd.txt
#
#  source actionsSedCmd.txt
#----------------------------------------------

As a separate process, the code to create the QMenus and menu QActions from 
the generated "ui_Rpl...h" files was copied off to the new Rpl...Menu C++ 
modules, and cleaned up. (See the four new files added in this commit).

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