Fix various warnings. The core, the scripts and the tools now compile without warnings with -Wall -Wextra -pedantic.

-Fix warnings from -Woverflow on implicit constant conversion.
-Fix warnings from -pedantic.
-Fix warnings from -pedantic.
-Fix warnings from -Wformat.

Two minor changes in addition :

-Replace a defined value equal to 2^31 - 1 by std::numeric_limits<int>::max().
-Remove useless null-check on pointer returned by new. New doesn't returns nullptr on failure, it throws std::bad_alloc.

src/server/scripts/Commands/cs_modify.cpp

@@ -1020,7 +1020,7 @@ public:
             }
             else
             {
-                if (newmoney > MAX_MONEY_AMOUNT)
+                if (newmoney > static_cast<int32>(MAX_MONEY_AMOUNT))
                     newmoney = MAX_MONEY_AMOUNT;
 
                 handler->PSendSysMessage(LANG_YOU_TAKE_MONEY, abs(moneyToAdd), handler->GetNameLink(target).c_str());
@@ -1035,10 +1035,7 @@ public:
             if (handler->needReportToTarget(target))
                 ChatHandler(target->GetSession()).PSendSysMessage(LANG_YOURS_MONEY_GIVEN, handler->GetNameLink().c_str(), moneyToAdd);
 
-            if (moneyToAdd >= MAX_MONEY_AMOUNT)
-                moneyToAdd = MAX_MONEY_AMOUNT;
-
-            if (targetMoney >= uint32(MAX_MONEY_AMOUNT) - moneyToAdd)
+            if (targetMoney >= MAX_MONEY_AMOUNT - moneyToAdd)
                 moneyToAdd -= targetMoney;
 
             target->ModifyMoney(moneyToAdd);