UI: Add option to disable aero on windows vista/7

On windows vista/7, you cannot really use display capture efficiently
without disabling aero, so this will add an option to settings to allow
it to be disabled and cause it to be disabled on startup.

obs/window-basic-main.cpp

@@ -683,6 +683,15 @@ void OBSBasic::OBSInit()
 	if (!previewEnabled)
 		QMetaObject::invokeMethod(this, "TogglePreview",
 				Qt::QueuedConnection);
+
+#ifdef _WIN32
+	uint32_t winVer = GetWindowsVersion();
+	if (winVer > 0 && winVer < 0x602) {
+		bool disableAero = config_get_bool(basicConfig, "Video",
+				"DisableAero");
+		SetAeroEnabled(!disableAero);
+	}
+#endif
 }
 
 void OBSBasic::InitHotkeys()
@@ -888,6 +897,17 @@ OBSBasic::~OBSBasic()
 	config_set_bool(App()->GlobalConfig(), "BasicWindow", "PreviewEnabled",
 			previewEnabled);
 	config_save(App()->GlobalConfig());
+
+#ifdef _WIN32
+	uint32_t winVer = GetWindowsVersion();
+	if (winVer > 0 && winVer < 0x602) {
+		bool disableAero = config_get_bool(basicConfig, "Video",
+				"DisableAero");
+		if (disableAero) {
+			SetAeroEnabled(true);
+		}
+	}
+#endif
 }
 
 void OBSBasic::SaveProject()