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_maki.cpp

@@ -114,7 +114,7 @@ int daObj_Maki_Execute(obj_maki_class* i_this) {
             cxyz.y += 20000.0f;
             i_this->field_0x6f8[0] = dComIfGp_particle_set(
                 i_this->field_0x6f8[0], 0x820b, &i_this->current.pos, &i_this->tevStr,
-                &i_this->shape_angle, 0, 0xff, 0, 0xffffffff, 0, 0, 0);
+                &i_this->shape_angle, 0, 0xff, 0, -1, 0, 0, 0);
             fopAcM_seStartLevel(i_this, 0x800a6, 0);
         }
     }