Enable heap dump on server crash

run-server

@@ -5,4 +5,4 @@ if [[ $# -eq 0 ]] ; then
 fi
 
 ./gradlew server:dist -Pbuildversion=$1
-java -jar server/build/libs/server-release.jar
+java -jar -XX:+HeapDumpOnOutOfMemoryError server/build/libs/server-release.jar

server/src/io/anuke/mindustry/server/ServerControl.java

@@ -777,7 +777,7 @@ public class ServerControl implements ApplicationListener{
                         }
                     }
                 }catch(IOException e){
-                    err("Terminating socket.");
+                    err("Terminating socket server.");
                     e.printStackTrace();
                 }
             });