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_title.cpp

@@ -1,4 +1,4 @@
-#include "d/dolzel_rel.h"
+#include "d/dolzel_rel.h" // IWYU pragma: keep
 
 #include "d/actor/d_a_title.h"
 #include "d/d_demo.h"
@@ -279,7 +279,7 @@ void daTitle_c::nextScene_init() {
 void daTitle_c::nextScene_proc() {
     if (!fopOvlpM_IsPeek() && !mDoRst::isReset()) {
         scene_class* playScene = fopScnM_SearchByID(dStage_roomControl_c::getProcID());
-        JUT_ASSERT(706, playScene != 0);
+        JUT_ASSERT(706, playScene != NULL);
         fopScnM_ChangeReq(playScene, 13, 0, 5);
 #if VERSION != VERSION_SHIELD_DEBUG
         mDoGph_gInf_c::setFadeColor(*(JUtility::TColor*)&g_blackColor);