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/d_bg_s.cpp

@@ -3,7 +3,7 @@
  * Background (Map) Collision main handler
  */
 
-#include "d/dolzel.h"
+#include "d/dolzel.h" // IWYU pragma: keep
 
 #include "d/d_bg_s.h"
 #include "d/d_bg_s_sph_chk.h"
@@ -131,7 +131,7 @@ bool cBgS::LineCross(cBgS_LinChk* p_line) {
 
 /* 800744A0-80074578 06EDE0 00D8+00 0/0 51/51 231/231 .text GroundCross__4cBgSFP11cBgS_GndChk */
 f32 cBgS::GroundCross(cBgS_GndChk* p_gnd) {
-    p_gnd->SetNowY(-1000000000.0f);
+    p_gnd->SetNowY(-G_CM3D_F_INF);
     p_gnd->ClearPi();
     p_gnd->PreCheck();