0027350: Support for Universal Windows Platform

- Toolchain file to configure a Visual Studio generator for a Windows 10 Universal Application was added (CMake).
- There is no support for environment variables in UWP.
- SID is not supported (were excluded).
- Windows registry is not supported (were excluded).
- Mess with usage of Unicode/ANSI was corrected.
- Added sample to check UWP functionality.
- Excluded usage of methods with Unicode characters where it is possible.
- Minor corrections to allow building OCAF (except TKVCAF) and DE (except VRML and XDE)
- Building of unsupported modules for UWP platform is off by default .
- Checking of DataExchange functionality was added to XAML (UWP) sample.
- Added information about UWP to the documentation.
- Update of results of merge with issue 27801

src/XmlLDrivers/XmlLDrivers_DocumentStorageDriver.cxx

@@ -200,11 +200,12 @@ Standard_Boolean XmlLDrivers_DocumentStorageDriver::WriteToDomDocument (const Ha
     "CSF_XmlOcafResource",
     "CASROOT"
   };
-  TCollection_AsciiString aResourceDir = "";
-  aResourceDir = getenv (aCSFVariable[0]);
+  OSD_Environment anEnv (aCSFVariable[0]);
+  TCollection_AsciiString aResourceDir = anEnv.Value();
   if (aResourceDir.IsEmpty()) {
     // now try by CASROOT
-    aResourceDir = getenv (aCSFVariable[1]);
+    OSD_Environment anEnv2(aCSFVariable[1]);
+    aResourceDir = anEnv2.Value();
     if ( !aResourceDir.IsEmpty() ) {
       aResourceDir += "/src/XmlOcafResource" ;
       aToSetCSFVariable = Standard_True; //CSF variable to be set later