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

include/JSystem/JAudio2/JAISeMgr.h

@@ -15,7 +15,7 @@ struct JASNonCopyable {
     JASNonCopyable() {}
     ~JASNonCopyable() {}
 
-    /* 0x0 */ int field_0x0;
+    /* 0x0 */ void* field_0x0;
 };  // Size: 0x4
 
 /**
@@ -56,7 +56,7 @@ public:
         mParams.init();
         mMaxActiveSe = 0;
         mMaxInactiveSe = 0;
-        field_0x0 = 0;
+        field_0x0 = NULL;
     }
 
     virtual bool isUsingSeqData(const JAISeqDataRegion& seqDataRegion);

include/JSystem/JAudio2/JAISound.h

@@ -5,6 +5,7 @@
 #include "JSystem/JAudio2/JAIAudible.h"
 #include "JSystem/JUtility/JUTAssert.h"
 #include "global.h"
+#include <cstdint>
 
 class JAISound;
 
@@ -134,7 +135,7 @@ struct JAISoundStatus_ {
             u8 flag8 : 1;
         } flags;
     } state;
-    /* 0x4 */ u32 userdata_;
+    /* 0x4 */ uintptr_t userdata_;
 };  // Size: 0x8
 
 /**
@@ -294,8 +295,8 @@ public:
     void setAnimationState(u32 state) {
         status_.state.flags.animationState = state;
     }
-    u32 getUserData() const { return status_.userdata_; }
-    void setUserData(u32 userData) { status_.userdata_ = userData; }
+    uintptr_t getUserData() const { return status_.userdata_; }
+    void setUserData(uintptr_t userData) { status_.userdata_ = userData; }
     JAIAudible* getAudible() { return audible_; }
     bool isHandleAttached() const { return handle_ != NULL; }
     bool hasLifeTime() const { return status_.field_0x1.flags.flag2; }

include/JSystem/JAudio2/JASDSPInterface.h

@@ -112,7 +112,7 @@ namespace JASDsp {
     void invalChannelAll();
     void initBuffer();
     int setFXLine(u8, s16*, JASDsp::FxlineConfig_*);
-    BOOL changeFXLineParam(u8, u8, u32);
+    BOOL changeFXLineParam(u8, u8, uintptr_t);
 
     extern u8 const DSPADPCM_FILTER[64];
     extern u32 const DSPRES_FILTER[320];

include/JSystem/JAudio2/JASResArcLoader.h

@@ -8,10 +8,10 @@ namespace JASResArcLoader {
     size_t getResSize(JKRArchive const*, u16);
     size_t getResMaxSize(JKRArchive const*);
     static void loadResourceCallback(void*);
-    int loadResourceAsync(JKRArchive*, u16, u8*, u32, void (*)(u32, u32), u32);
+    int loadResourceAsync(JKRArchive*, u16, u8*, u32, void (*)(u32, uintptr_t), uintptr_t);
 
     // from pikmin2
-    typedef void (*LoadCallback)(u32, u32);
+    typedef void (*LoadCallback)(u32, uintptr_t);
 
     struct TLoadResInfo {
         inline TLoadResInfo(JKRArchive* archive, u16 id, void* buf, u32 size)
@@ -30,7 +30,7 @@ namespace JASResArcLoader {
         void* mBuffer;          // _08
         u32 mBufferSize;        // _0C
         LoadCallback mCallback; // _10
-        u32 mCallbackArg;       // _14, arg to pass to mCallback along with readResource result
+        uintptr_t mCallbackArg; // _14, arg to pass to mCallback along with readResource result
         OSMessageQueue* mQueue; // _18
     };
 };