chore: remove all memory leaks

src/ppu.zig

@@ -10,17 +10,27 @@ pub const Ppu = struct {
             .vram = try Vram.init(alloc),
         };
     }
+
+    pub fn deinit(self: *@This()) void {
+        self.vram.deinit();
+    }
 };
 
 const Vram = struct {
     buf: []u8,
+    alloc: Allocator,
 
     fn init(alloc: Allocator) !@This() {
         return @This(){
             .buf = try alloc.alloc(u8, 0x18000),
+            .alloc = alloc,
         };
     }
 
+    fn deinit(self: *@This()) void {
+        self.alloc.free(self.buf);
+    }
+
     pub inline fn get32(self: *const @This(), idx: usize) u32 {
         return (@as(u32, self.buf[idx + 3]) << 24) | (@as(u32, self.buf[idx + 2]) << 16) | (@as(u32, self.buf[idx + 1]) << 8) | (@as(u32, self.buf[idx]));
     }