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_lbox.cpp

@@ -3,7 +3,7 @@
  * Object - Unused Block (HIO Label is "Block for boss battle")
  */
 
-#include "d/dolzel_rel.h"
+#include "d/dolzel_rel.h" // IWYU pragma: keep
 
 #include "d/actor/d_a_obj_lbox.h"
 #include "SSystem/SComponent/c_math.h"
@@ -137,7 +137,7 @@ static int useHeapInit(fopAc_ac_c* i_this) {
     obj_lbox_class* a_this = static_cast<obj_lbox_class*>(i_this);
 
     J3DModelData* modelData = (J3DModelData*)dComIfG_getObjectRes("Obj_lbox", 4);
-    JUT_ASSERT(478, modelData != 0);
+    JUT_ASSERT(478, modelData != NULL);
     a_this->mpModel = mDoExt_J3DModel__create(modelData, 0x80000, 0x11000084);
     if (a_this->mpModel == NULL) {
         return 0;