Fixed|Win32: Fixed native path issues

The application binary path is a native path so it needs
native separators. Also, the plugins binary path needs to
be concatenated as a native path.

doomsday/libdeng2/include/de/data/string.h

@@ -113,6 +113,9 @@ class DENG2_PUBLIC String : public QString
     /// Does a path concatenation on this string and the argument.
     String operator / (const String& path) const;
 
+    /// Converts path separates to native separators.
+    String toNativePath() const;
+
     /// Does a path concatenation on a native path. The directory separator
     /// character depends on the platform.
     String concatenateNativePath(const String& nativePath) const;

doomsday/libdeng2/src/core/app.cpp

@@ -41,7 +41,7 @@ App::App(int& argc, char** argv, GUIMode guiMode)
 #endif
     //_logBuffer.enable(Log::TRACE);
 
-    _appPath = applicationFilePath();
+    _appPath = String(applicationFilePath()).toNativePath();
 
     LOG_INFO("Application path: ") << _appPath;
 
@@ -59,7 +59,7 @@ String App::nativeBinaryPath()
 {
     String path;
 #ifdef WIN32
-    path = _appPath.fileNameNativePath() / "plugins";
+    path = _appPath.fileNameNativePath().concatenateNativePath("plugins");
 #else
 # ifdef MACOSX
     path = _appPath.fileNameNativePath() / "../DengPlugins";

doomsday/libdeng2/src/data/string.cpp

@@ -85,6 +85,17 @@ String String::operator / (const String& path) const
     return concatenatePath(path);
 }
 
+String String::toNativePath() const
+{
+    String native = *this;
+#ifdef WIN32
+    native.replace('/', '\\');
+#else
+    native.replace('\\', '/');
+#endif
+    return native;
+}
+
 String String::concatenatePath(const String& other, QChar dirChar) const
 {
     if(other.first() == dirChar)