[General] Move credits integrity error message to new ErrorMessages file

Additionally, use correct log level for credit integrity message on server.

apps/openmw-mp/main.cpp

@@ -9,6 +9,7 @@
 #include <components/settings/settings.hpp>
 #include <components/version/version.hpp>
 
+#include <components/openmw-mp/ErrorMessages.hpp>
 #include <components/openmw-mp/Log.hpp>
 #include <components/openmw-mp/NetworkMessages.hpp>
 #include <components/openmw-mp/Utils.hpp>
@@ -216,10 +217,8 @@ int main(int argc, char *argv[])
 
     if (!hasValidCredits)
     {
-        LOG_MESSAGE_SIMPLE(Log::LOG_INFO, "To respect the hard work that has gone into\n"
+        LOG_MESSAGE_SIMPLE(Log::LOG_FATAL, "The server is shutting down");
-            "creating TES3MP, you are required to keep an unmodified tes3mp-credits file\n"
+        LOG_APPEND(Log::LOG_FATAL, "- %s", TES3MP_CREDITS_ERROR);
-            "corresponding to this version of the code in the same folder as this\n"
-            "executable. It can have either an .md or a .txt extension.");
         return 1;
     }
 

components/CMakeLists.txt

@@ -146,7 +146,7 @@ add_component_dir (version
     )
 
 add_component_dir (openmw-mp
-        Log Utils NetworkMessages Version
+        Log Utils ErrorMessages NetworkMessages Version
         )
 
 add_component_dir (openmw-mp/Base

components/openmw-mp/ErrorMessages.hpp

@@ -0,0 +1,9 @@
+#ifndef OPENMW_ERRORMESSAGES_HPP
+#define OPENMW_ERRORMESSAGES_HPP
+
+#define TES3MP_CREDITS_ERROR ("To respect the hard work that has gone into creating TES3MP, you are\n"\
+    "required to keep an unmodified tes3mp-credits file corresponding to this\n"\
+    "version of the code in the same folder as this executable. It can have either\n"\
+    "an .md or a .txt extension.")
+
+#endif //OPENMW_ERRORMESSAGES_HPP