More GCC compatibility/warning fixes (#3118)

* Wrap >4-char literals in a MULTI_CHAR macro

Modern compilers do not support CW's non-standard behavior with
>4 char literals. We can, however, use a constexpr function to
compute the u64 values directly. This leaves <=4 char literals
unchanged.

* Replace non-pointer usages of NULL with 0

* Define NULL to nullptr on C++11 and above

* Fix more -Wpointer-arith and -Woverflow warnings

* Replace u32/s32 with uintptr_t/intptr_t where appropriate

* JSUOutputStream: Overload all standard int types

src/d/actor/d_a_obj_rfHole.cpp

@@ -157,7 +157,7 @@ void daRfHole_c::setBreakEffect() {
     mDoMtx_stack_c::multVec(&acStack_24, &acStack_24);
     cXyz cStack_30 = current.pos + acStack_24;
     for (int i = 0; i < 5; i++) {
-        dComIfGp_particle_set(particle_id[i], &cStack_30, NULL, &scale, 0xff, 0, 0xffffffff, NULL,
+        dComIfGp_particle_set(particle_id[i], &cStack_30, NULL, &scale, 0xff, 0, -1, NULL,
                               NULL, NULL);
     }
 }