Alien Ruin fix, various cherrypicked upstream fixes

Also adds new buildmode

code/modules/mob/login.dm

@@ -41,12 +41,14 @@
 	update_client_colour()
 	update_mouse_pointer()
 	if(client)
-		client.click_intercept = null
-
 		client.change_view(CONFIG_GET(string/default_view)) // Resets the client.view in case it was changed.
 
 		if(client.player_details.player_actions.len)
 			for(var/datum/action/A in client.player_details.player_actions)
 				A.Grant(src)
 
+		for(var/foo in client.player_details.post_login_callbacks)
+			var/datum/callback/CB = foo
+			CB.Invoke()
+
 	log_message("Client [key_name(src)] has taken ownership of mob [src]([src.type])", LOG_OWNERSHIP)