fix: EPMCLI example missing QCoreApplication caused unreliable path resolution

EPMCLI.exe's main() never constructed a QCoreApplication/QApplication
object, yet its call chain (InitializeEPMDev -> EPMPreferences::setAppName
-> defaultPlatformPath -> epmConfigRoot -> applicationDataPath ->
installFolderName -> QCoreApplication::applicationDirPath()) depends on
one existing. Without it, applicationDirPath() emits a runtime warning
and returns an unreliable result, causing installFolderName() to fall
back to a default value instead of correctly deriving the actual install
folder name. This meant EPMCLI could look in the wrong ProgramData
namespace for configs depending on how the package was installed.

Fixed by constructing a minimal QCoreApplication at the start of main(),
matching the pattern already used correctly by all real GUI apps.

Author: hangzqcom

examples/C++/epm-cli/main.cpp

@@ -12,6 +12,7 @@ wchar_t	gDeviceName[1024];
 #include "Range.h"
 
 // Qt
+#include <QCoreApplication>
 #include <QList>
 #include <QString>
 #include <QStringList>
@@ -31,8 +32,7 @@ typedef QList<EPMDeviceDesc> EPMDeviceDescriptors;
 
 int main(int argc, char* argv[])
 {
-	(void) argc;
-	(void) argv;
+	QCoreApplication a(argc, argv);
 
 	char temp[1024];