JUTXfb: decompile (#38)

* m_Do_Reset: split and (some) decomp

decompiles:
- my_OSCancelAlarmAll()
- destroyVideo()

* mDoRst::reset(): decompile, plus some supporting code

* split DVD* functions to dvd.h

* mDoRst::resetCallBack(): decompile

* JUTXfb: split

* JUTXfb: decompile (except for almost-matching ctor)

Elaborates JUTVideo and some related stuff.
Decompiles the following functions:
- JUTXfb::initiate()
- JUTXfb::createManager()
- JUTXfb::common_init()
- JUTXfb::destroyManager()
- JUTXfb::~JUTXfb()
- JUTXfb::JUTXfb(): *almost* matching up to regalloc

* clang-format and extern label modifications

Co-authored-by: Pheenoh <pheenoh@gmail.com>

include/gx/GX.h

@@ -0,0 +1,27 @@
+#ifndef __GX_H__
+#define __GX_H__
+
+#include "dolphin/types.h"
+
+struct GXRenderModeObj {
+    s32 vi_tv_mode;
+    u16 fb_width;
+    u16 efb_height;
+    u16 xfb_height;
+    u16 vi_x_origin;
+    u16 vi_y_origin;
+    u16 vi_width;
+    u16 vi_height;
+    s32 xfb_mode;
+    u8 field_rendering;
+    u8 antialiasing;
+    u8 sample_pattern[12][2];
+    u8 vfilter[7];
+};
+
+extern "C" {
+f32 GXGetYScaleFactor(u16 efb_height, u16 xfb_height);
+u16 GXGetNumXfbLines(u32 efb_height, f32 y_scale);
+}
+
+#endif