feat(core): add font set, quirks config, and save-state snapshot

src/Chip8.Core/Quirks.cs

@@ -0,0 +1,56 @@
+namespace Chip8.Core;
+
+public sealed class Quirks
+{
+    public bool shiftUsesVy { get; set; }
+
+    public bool jumpWithVx { get; set; }
+
+    public bool loadStoreIncrementsI { get; set; }
+
+    public bool resetVfOnLogic { get; set; }
+
+    public bool clipSprites { get; set; }
+
+    public bool addToIndexSetsCarry { get; set; }
+
+    public static Quirks cosmacVip() => new()
+    {
+        shiftUsesVy = true,
+        jumpWithVx = false,
+        loadStoreIncrementsI = true,
+        resetVfOnLogic = true,
+        clipSprites = true,
+        addToIndexSetsCarry = false,
+    };
+
+    public static Quirks modern() => new()
+    {
+        shiftUsesVy = false,
+        jumpWithVx = false,
+        loadStoreIncrementsI = false,
+        resetVfOnLogic = false,
+        clipSprites = true,
+        addToIndexSetsCarry = false,
+    };
+
+    public static Quirks superChip() => new()
+    {
+        shiftUsesVy = false,
+        jumpWithVx = true,
+        loadStoreIncrementsI = false,
+        resetVfOnLogic = false,
+        clipSprites = true,
+        addToIndexSetsCarry = false,
+    };
+
+    public static Quirks xoChip() => new()
+    {
+        shiftUsesVy = false,
+        jumpWithVx = false,
+        loadStoreIncrementsI = false,
+        resetVfOnLogic = false,
+        clipSprites = false,
+        addToIndexSetsCarry = false,
+    };
+}