6-22-2017:

RiverWare "About" Dialog:  Report ICU version from ICU header file symbols
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 7.2

We recently added an indication of the ICU library used with Qt5 and RiverWare
in the "About" dialog.  But this was just hard-coded text.  This commit
replaces that hard-coded text with version number parts from ICU compile-time
symbols, defined in this header file:

  C:\Riverware\tools\icu-57.1\include\unicode\uvernum.h

The path of that header file was added to the include path defined in 
Makefiles/riverwarebase.pro.  (That takes effect after regenerating *.vcxproj 
files with qmake.pl -- SEE the prior commit).

Notice the change in the ICU version number in the 2nd screenshot -- it has 
three parts:  ICU "57.1.0".

  http://cadswes2.colorado.edu/~philw/2017/BuildNotes/AboutDialog/2017-06-22a.png
  http://cadswes2.colorado.edu/~philw/2017/BuildNotes/AboutDialog/2017-06-22b.png

See the change in Q3GUI/AboutDlg.cpp.  The code below illustrates the ICU 
symbols used:

   const QString icuVersion =
      QString("%1.%2.%3")
      .arg (U_ICU_VERSION_MAJOR_NUM)
      .arg (U_ICU_VERSION_MINOR_NUM)
      .arg (U_ICU_VERSION_PATCHLEVEL_NUM);

These symbols are described on this webpage:
http://icu-project.org/apiref/icu4c/uvernum_8h.html

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