Add demo state and config loading

src/state.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <string>
+#include <memory>
+#include <cpptoml.h>
+#include "project.h"
+
+struct Config {
+	static Config from_file(std::string path) {
+		auto manifest = cpptoml::parse_file(path);
+		return Config::from_toml(manifest);
+	}
+	static Config from_toml(std::shared_ptr<cpptoml::table> manifest) {
+		auto config = Config();
+		config.stylepath = manifest->get_as<std::string>("style").value_or("");
+
+		return config;
+	}
+
+	std::string stylepath;
+};
+
+struct DemoState {
+	DemoState(std::shared_ptr<Config> config)
+		: running(true), current_project(nullptr),
+		  config(config) {}
+
+    int width, height; float ratio;
+
+    std::shared_ptr<Project> current_project;
+    std::shared_ptr<Config> config;
+
+	bool running;
+};