Check client version type against server version type (#367)

build.gradle

@@ -20,7 +20,7 @@ allprojects {
     ext {
         versionNumber = '4'
         versionModifier = 'alpha'
-        versionType = 'official'
+        if (!project.hasProperty("versionType")) versionType = 'official'
         appName = 'Mindustry'
         gdxVersion = '1.9.9'
         roboVMVersion = '2.3.0'

core/src/io/anuke/mindustry/core/NetServer.java

@@ -127,7 +127,7 @@ public class NetServer extends Module{
                 return;
             }
 
-            if(packet.versionType == null || ((packet.version == -1 || !packet.versionType.equals("official")) && Version.build != -1 && !admins.allowsCustomClients())){
+            if(packet.versionType == null || ((packet.version == -1 || !packet.versionType.equals(Version.type)) && Version.build != -1 && !admins.allowsCustomClients())){
                 kick(id, KickReason.customClient);
                 return;
             }