graphics: add experimental Pro mode and linear PSSR

Co-authored-by: Joshua Jayasingh <joshuajayasingh08@gmail.com>

src/common/emulatorConfig.cpp

@@ -113,6 +113,10 @@ bool VrEnabled() {
 	return g_config->vr_enabled;
 }
 
+bool Ps5ProEnabled() {
+	return g_config->pro_enabled;
+}
+
 bool AmdCpuEnabled() {
 	return g_config->amd_cpu_enabled;
 }