pipeline: persist shaders and pipelines per game and prewarm them at boot

src/common/emulatorConfig.cpp

@@ -133,6 +133,10 @@ bool ShaderValidationEnabled() {
 	return g_config->shader_validation_enabled;
 }
 
+bool ShaderCacheEnabled() {
+	return g_config->shader_cache_enabled;
+}
+
 ShaderOptimizationType GetShaderOptimizationType() {
 	return g_config->shader_optimization_type;
 }