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_bg.cpp

@@ -3,7 +3,7 @@
  * 
 */
 
-#include "d/dolzel_rel.h"
+#include "d/dolzel_rel.h" // IWYU pragma: keep
 
 #include "d/actor/d_a_bg.h"
 #include "d/d_com_inf_game.h"
@@ -515,7 +515,7 @@ int daBg_c::create() {
         JKRExpHeap* room_heap = dStage_roomControl_c::getMemoryBlock(roomNo);
         if (room_heap != NULL) {
             this->heap = JKRCreateSolidHeap(-1, room_heap, false);
-            JUT_ASSERT(471, heap != 0);
+            JUT_ASSERT(471, heap != NULL);
 
             JKRHeap* old = mDoExt_setCurrentHeap(this->heap);
             int rt = createHeap();