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_lp.cpp

@@ -3,7 +3,7 @@
  * 
 */
 
-#include "d/dolzel_rel.h"
+#include "d/dolzel_rel.h" // IWYU pragma: keep
 
 #include "d/actor/d_a_obj_lp.h"
 #include "d/actor/d_a_canoe.h"
@@ -487,7 +487,7 @@ static int daObj_Lp_Create(fopAc_ac_c* a_this) {
         daObj_Lp_Execute(i_this);
 
         J3DModelData* modelData = (J3DModelData*)dComIfG_getObjectRes("Obj_lp", 3);
-        JUT_ASSERT(0x3b0, modelData != 0);
+        JUT_ASSERT(0x3b0, modelData != NULL);
 
         dComIfGp_addSimpleModel(modelData, fopAcM_GetRoomNo(a_this), 0);
         if (modelData == NULL) {