Rewrite on simdjson with a flat src and smack-style build

src/save.h

@@ -0,0 +1,66 @@
+#pragma once
+
+#include "common.h"
+#include <string>
+#include <vector>
+
+enum Measurement
+{
+    MEASUREMENT_METRIC,
+    MEASUREMENT_IMPERIAL
+};
+
+// The game's preferences, kept in settings.txt.
+struct Settings
+{
+    std::string lastCharacter;
+    Color color = {0.12f, 0.515f, 0.115f, 1};
+    int height = 900;
+    int volume = 50;
+    int width = 1600;
+    Measurement measurement = MEASUREMENT_METRIC;
+    bool isCharacterColor = true;
+    bool isConsole = false;
+    bool isMuted = false;
+
+    void load();
+    void save();
+    void reset();
+    template <class Visitor> void visit(Visitor&& visitor);
+};
+
+struct SavedItem
+{
+    std::string name;
+    Vec2 position;
+    Vec2 velocity;
+    float rotation = 0;
+};
+
+// A character's progress, kept in saves/<character>.txt, and the live state of one being played.
+struct Progress
+{
+    std::vector<std::string> discovered;
+    std::vector<SavedItem> items;
+    Vec2 pan;
+    float calories = 0;
+    float capacity = 0;
+    float digestionProgress = 0;
+    float digestionRate = 0;
+    float playtime = 0;
+    float totalCalories = 0;
+    float weight = 0;
+    float zoom = 0;
+    int digestionTimer = 0;
+    int spawnDelay = 0;
+    int totalConsumed = 0;
+    int totalSpawned = 0;
+    bool isAlternate = false;
+    bool isDigesting = false;
+    bool isPostgame = false;
+    bool isValid = false;
+
+    void load(const std::string& path);
+    void save(const std::string& path);
+    template <class Visitor> void visit(Visitor&& visitor);
+};