Core/CrashHandler: Compile WheatyExceptionReport only once and moved its global variable initializer to all projects using it

src/tools/map_extractor/System.cpp

@@ -1567,3 +1567,9 @@ int main(int argc, char * arg[])
 
     return 0;
 }
+
+#if TRINITY_PLATFORM == TRINITY_PLATFORM_WINDOWS
+#include "WheatyExceptionReport.h"
+// must be at end of file because of init_seg pragma
+INIT_CRASH_HANDLER();
+#endif