SteamTarget: Change to subsystem Windows

according to https://github.com/SFML/SFML/issues/1192

SteamTarget/SteamTarget.vcxproj

@@ -85,7 +85,7 @@
       <LanguageStandard>stdcpp14</LanguageStandard>
     </ClCompile>
     <Link>
-      <SubSystem>Console</SubSystem>
+      <SubSystem>Windows</SubSystem>
       <OutputFile>$(OutDir)\$(ProjectName).exe</OutputFile>
       <AdditionalLibraryDirectories>..\dependencies\VigemClient\;..\dependencies\SFML-2.4.2-x86\lib;$(QTDIR)\lib;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
       <GenerateDebugInformation>true</GenerateDebugInformation>

SteamTarget/TargetOverlay.cpp

@@ -27,7 +27,6 @@ bool TargetOverlay::init(bool hidden, bool overlay_only_config)
 	const sf::VideoMode mode = sf::VideoMode::getDesktopMode();
 	window_.create(sf::VideoMode(mode.width - 16, mode.height - 32), "GloSC_OverlayWindow");
 	//Window is too large ; always 16 and 32 pixels?  - sf::Style::None breaks transparency!
-
 	window_.setFramerateLimit(30);
 	window_.setPosition({ 0, 0 });
 	last_foreground_window_ = window_.getSystemHandle();

SteamTarget/main.cpp

@@ -14,11 +14,17 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 #include <QtCore/QCoreApplication>
+#include <Windows.h>
 #include "SteamTarget.h"
 
-int main(int argc, char *argv[])
+int CALLBACK WinMain(
+	_In_ HINSTANCE hInstance,
+	_In_ HINSTANCE hPrevInstance,
+	_In_ LPSTR     lpCmdLine,
+	_In_ int       nCmdShow
+)
 {
-	SteamTarget target(argc, argv);
+	SteamTarget target(__argc, __argv);
 	target.init();
 	return SteamTarget::exec();
 }