Fix JUT_ASSERT and several other macros (#2711)

* Fix JUT_ASSERT to be a nested define

* Switch names that appear in asserts to be constants instead of defines

* Replace `0` in asserts with `NULL` or `FALSE`

* Fix fpclassify

* Fix ARRAY_SIZE

* Use G_CM3D_F_INF

* More fixes for fpclassify

* Remove FLOAT_LABEL

* Remove incorrect FLAG_ON macro

* Remove UNK_BSS macro

* Silence clangd unused header warning for PCH

src/d/actor/d_a_obj_digsnow.cpp

@@ -3,7 +3,7 @@
 // Object - Dig Snow
 //
 
-#include "d/dolzel_rel.h"
+#include "d/dolzel_rel.h" // IWYU pragma: keep
 
 #include "d/actor/d_a_obj_digsnow.h"
 #include "d/actor/d_a_player.h"
@@ -43,7 +43,7 @@ static char* l_arcName = "Y_horiyuk";
 /* 80BDCD64-80BDCDD4 000184 0070+00 1/0 0/0 0/0 .text            CreateHeap__14daObjDigSnow_cFv */
 int daObjDigSnow_c::CreateHeap() {
     J3DModelData* modelData = (J3DModelData*)dComIfG_getObjectRes(l_arcName, 4);
-    JUT_ASSERT(0x9F, modelData != 0);
+    JUT_ASSERT(0x9F, modelData != NULL);
     mpModel = mDoExt_J3DModel__create(modelData, 0x80000, 0x11000084);
 
     if (mpModel == NULL) {
@@ -121,7 +121,7 @@ void daObjDigSnow_c::mode_init_dig() {
     obj_gnd_chk.SetPos(&current.pos);
 
     f32 gnd_height = dComIfG_Bgsp().GroundCross(&obj_gnd_chk);
-    if (gnd_height != -1000000000.0f) {
+    if (gnd_height != -G_CM3D_F_INF) {
         mGroundHeight = gnd_height;
     } else {
 #ifdef DEBUG