Rename surface map to collision mesh (#637)

src/code_800029B0.c

@@ -70,9 +70,9 @@ s16 gCreditsCourseId = COURSE_LUIGI_RACEWAY;
 s16 gPlaceItemBoxes = 1;
 
 // Technically a pointer to an array, but declaring it so creates regalloc issues.
-mk64_surface_map_ram *gSurfaceMap;
+CollisionTriangle *gCollisionMesh;
 u16 *D_8015F584;
-u16 D_8015F588; // Number of entries in gSurfaceMap
+u16 gCollisionMeshCount; // Number of entries in gCollisionMesh
 u16 D_8015F58A;
 u32 D_8015F58C;