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

1 files changed, 2 insertions, 2 deletions

diff --git a/src/d/actor/d_a_obj_lv6ChangeGate.cpp b/src/d/actor/d_a_obj_lv6ChangeGate.cpp
index a28b3dca48..da9f2efe23 100644
--- a/src/d/actor/d_a_obj_lv6ChangeGate.cpp
+++ b/src/d/actor/d_a_obj_lv6ChangeGate.cpp
@@ -127,7 +127,7 @@ int daLv6ChangeGate_c::Execute(Mtx** param_0) {
 
     for (int i = 0; i < 12; i++) {
         cXyz spC(cyl_x_offset + mMoveTransX, 0.0f, 0.0f);
-        mDoMtx_stack_c::ZXYrotS(NULL, shape_angle.y, shape_angle.z);
+        mDoMtx_stack_c::ZXYrotS(0, shape_angle.y, shape_angle.z);
         mDoMtx_stack_c::multVec(&spC, &spC);
         spC += current.pos;
 
@@ -251,7 +251,7 @@ void daLv6ChangeGate_c::init_modeBreak() {
 
 void daLv6ChangeGate_c::modeBreak() {
     cXyz effpos(mMoveTransX, 0.0f, 0.0f);
-    mDoMtx_stack_c::ZXYrotS(NULL, shape_angle.y, shape_angle.z);
+    mDoMtx_stack_c::ZXYrotS(0, shape_angle.y, shape_angle.z);
     mDoMtx_stack_c::multVec(&effpos, &effpos);
     effpos += current.pos;