Decompile Title overlay (#20)

* Decompile Title overlay

* math structs as cpp when applicable

* fixes and improvements

* regressions fix 1

* regressions fix 2

include/nitro/button.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#define BTN_A (1 << 0) // 0x0001
+#define BTN_B (1 << 1) // 0x0002
+#define BTN_SELECT (1 << 2) // 0x0004
+#define BTN_START (1 << 3) // 0x0008
+#define BTN_DRIGHT (1 << 4) // 0x0010
+#define BTN_DLEFT (1 << 5) // 0x0020
+#define BTN_DUP (1 << 6) // 0x0040
+#define BTN_DDOWN (1 << 7) // 0x0080
+#define BTN_R (1 << 8) // 0x0100
+#define BTN_L (1 << 9) // 0x0200
+
+#define CHECK_BUTTON_COMBO(value, btn) ((value) & (btn))