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_ten.cpp

@@ -3,7 +3,7 @@
  * 
 */
 
-#include "d/dolzel_rel.h"
+#include "d/dolzel_rel.h" // IWYU pragma: keep
 
 #include "d/actor/d_a_obj_ten.h"
 #include "d/actor/d_a_player.h"
@@ -63,7 +63,7 @@ void daObjTEN_c::SetCcSph() {
 static int useHeapInit(fopAc_ac_c* actor) {
     daObjTEN_c* i_this = static_cast<daObjTEN_c*>(actor);
     J3DModelData* modelData = (J3DModelData*)dComIfG_getObjectRes("I_Ten", 10);
-    JUT_ASSERT(246, modelData != 0);
+    JUT_ASSERT(246, modelData != NULL);
     i_this->mMorf = new mDoExt_McaMorfSO(modelData, NULL, NULL, NULL, 2, 1.0f, 0, -1,
                                          &i_this->mCreature, 0, 0x11000284);
     if (i_this->mMorf == NULL || i_this->mMorf->getModel() == NULL) {