Improving standard compiler compatibility (#2926)

* Adding explicit dolphin/ prefix & fix characters

* Rename ShiftJIS to SJIS

* Separate JASSeqReader read methods implementation between compilers.

* Fix pointer.h

* fix d_item_data typo

* fix gcn matching issue

include/JSystem/JAudio2/JASSeqReader.h

@@ -37,11 +37,23 @@ public:
     u8* getCur() { return field_0x04; }
     u32 readByte() { return *field_0x04++; }
     u32 read16() {
+#ifdef __MWERKS__
         return *((u16*)field_0x04)++;
+#else
+        u16* value = (u16*)field_0x04;
+        field_0x04 += 2;
+        return *value;
+#endif
     }
     u32 read24() {
         field_0x04--;
+#ifdef __MWERKS__
         return (*((u32*)field_0x04)++) & 0x00ffffff;
+#else
+        u32* value = (u32*)field_0x04;
+        field_0x04 += 4;
+        return (*value) & 0x00ffffff;
+#endif
     }
     u16 getLoopCount() const { 
         if (field_0x08 == 0) {