UI+build: Isolate wxWidgets code from non-GUI code (#1633)

src/mainLLE.cpp

@@ -1,7 +1,5 @@
-#include "gui/wxgui.h"
 #include "util/crypto/aes128.h"
-#include "gui/MainWindow.h"
-#include "gui/guiWrapper.h"
+#include "WindowSystem.h"
 #include "Common/FileStream.h"
 
 void CemuCommonInit();
@@ -38,7 +36,7 @@ void mainEmulatorLLE()
 	memory_initPhysicalLayout();
 	
 	// start GUI thread
-	gui_create();
+	WindowSystem::Create();
 	// load kernel ancast image
 	loadPPCBootrom();
 	loadEncryptedPPCAncastKernel();