Core/Shared: Change rand32 to return uin32 instead of int32

Fixes a crash that happened when rand32 returned negative values.
Also updated some related comments that were outdated since we changed to SFMT.

Closes #12638

src/server/game/Server/WorldSocket.cpp

@@ -31,7 +31,7 @@ using boost::asio::ip::tcp;
 using boost::asio::streambuf;
 
 WorldSocket::WorldSocket(tcp::socket&& socket)
-    : _socket(std::move(socket)), _authSeed(static_cast<uint32>(rand32())), _OverSpeedPings(0), _worldSession(nullptr)
+    : _socket(std::move(socket)), _authSeed(rand32()), _OverSpeedPings(0), _worldSession(nullptr)
 {
 }
 

src/server/game/Warden/WardenWin.cpp

@@ -281,7 +281,7 @@ void WardenWin::RequestData()
             }
             case MODULE_CHECK:
             {
-                uint32 seed = static_cast<uint32>(rand32());
+                uint32 seed = rand32();
                 buff << uint32(seed);
                 HmacHash hmac(4, (uint8*)&seed);
                 hmac.UpdateData(wd->Str);

src/server/shared/Utilities/Util.cpp

@@ -63,17 +63,17 @@ float frand(float min, float max)
     return float(GetRng()->Random() * (max - min) + min);
 }
 
-int32 rand32()
+uint32 rand32()
 {
-    return int32(GetRng()->BRandom());
+    return GetRng()->BRandom();
 }
 
-double rand_norm(void)
+double rand_norm()
 {
     return GetRng()->Random();
 }
 
-double rand_chance(void)
+double rand_chance()
 {
     return GetRng()->Random() * 100.0;
 }

src/server/shared/Utilities/Util.h

@@ -76,30 +76,23 @@ std::string secsToTimeString(uint64 timeInSecs, bool shortText = false, bool hou
 uint32 TimeStringToSecs(const std::string& timestring);
 std::string TimeToTimestampStr(time_t t);
 
-/* Return a random number in the range min..max; (max-min) must be smaller than 32768. */
+/* Return a random number in the range min..max. */
 int32 irand(int32 min, int32 max);
 
-/* Return a random number in the range min..max (inclusive). For reliable results, the difference
-* between max and min should be less than RAND32_MAX. */
+/* Return a random number in the range min..max (inclusive). */
 uint32 urand(uint32 min, uint32 max);
 
-/* Return a random number in the range 0 .. RAND32_MAX. */
-int32 rand32();
+/* Return a random number in the range 0 .. UINT32_MAX. */
+uint32 rand32();
 
 /* Return a random number in the range min..max */
 float frand(float min, float max);
 
-/* Return a random double from 0.0 to 1.0 (exclusive). Floats support only 7 valid decimal digits.
- * A double supports up to 15 valid decimal digits and is used internally (RAND32_MAX has 10 digits).
- * With an FPU, there is usually no difference in performance between float and double.
-*/
-double rand_norm(void);
+/* Return a random double from 0.0 to 1.0 (exclusive). */
+double rand_norm();
 
-/* Return a random double from 0.0 to 99.9999999999999. Floats support only 7 valid decimal digits.
- * A double supports up to 15 valid decimal digits and is used internally (RAND32_MAX has 10 digits).
- * With an FPU, there is usually no difference in performance between float and double.
-*/
-double rand_chance(void);
+/* Return a random double from 0.0 to 100.0 (exclusive). */
+double rand_chance();
 
 /* Return true if a random roll fits in the specified chance (range 0-100). */
 inline bool roll_chance_f(float chance)