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_e_df.cpp

@@ -3,7 +3,7 @@
  *
  */
 
-#include "d/dolzel_rel.h"
+#include "d/dolzel_rel.h" // IWYU pragma: keep
 
 #include "d/actor/d_a_e_df.h"
 #include "d/actor/d_a_obj_carry.h"
@@ -39,7 +39,7 @@ daE_DF_HIO_c::daE_DF_HIO_c() {
 /* 806A7710-806A7808 000110 00F8+00 1/1 0/0 0/0 .text            CreateHeap__8daE_DF_cFv */
 int daE_DF_c::CreateHeap() {
     J3DModelData* modelData = (J3DModelData*)dComIfG_getObjectRes("E_DF", 0xD);
-    JUT_ASSERT(161, modelData != 0);
+    JUT_ASSERT(161, modelData != NULL);
 
     mpMorfSO = new mDoExt_McaMorfSO(modelData, NULL, NULL,
                                     (J3DAnmTransform*)dComIfG_getObjectRes("E_DF", 10), 2, 1.0f, 0,