Fix ovl_Demo_Go non matchings (2/3 matched)

`z_demo_go.c` is now functionally equivalent and almost fully matched.

Note that I added a Vec3i struct in `z64actor.h` now used in `CsCmdActorAction`.

Also fixed some missing VT codes in various actor strings.

include/z64actor.h

@@ -13,6 +13,11 @@ struct GlobalContext;
 // From z64light.h
 struct LightMapper;
 
+typedef struct
+{
+    f32 x, y;
+} Vec2f;
+
 typedef struct
 {
     f32 x, y, z;
@@ -25,13 +30,8 @@ typedef struct
 
 typedef struct
 {
-    f32 x, y;
-} Vec2f;
-
-typedef struct
-{
-    u32 x, y;
-} Vec2i;
+    s32 x, y, z;
+} Vec3i;
 
 typedef struct
 {

include/z64cutscene.h

@@ -83,9 +83,9 @@ typedef struct
     /* 0x02 */ u16 startFrame;
     /* 0x04 */ u16 endFrame;
     /* 0x06 */ Vec3s rot;
-    /* 0x0C */ Vec3f startPos;
-    /* 0x18 */ Vec3f endPos;
-    /* 0x24 */ Vec3f normal;
+    /* 0x0C */ Vec3i startPos;
+    /* 0x18 */ Vec3i endPos;
+    /* 0x24 */ Vec3i normal;
 } CsCmdActorAction; // size = 0x30
 
 typedef enum