WebHost: request maximum amount of file handles from the system for autolauncher. (#625)

* WebHost: request maximum amount of file handles from the system for autolauncher.

* WebHostLib: wrap resource import into try to restore windows compatibility

WebHostLib/autolauncher.py

@@ -210,6 +210,16 @@ def run_guardian():
     global multiworlds
     with guardian_lock:
         if not guardian:
+            try:
+                import resource
+            except ModuleNotFoundError:
+                pass  # unix only module
+            else:
+                # Each Server is another file handle, so request as many as we can from the system
+                file_limit = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
+                # set soft limit to hard limit
+                resource.setrlimit(resource.RLIMIT_NOFILE, (file_limit, file_limit))
+
             def guard():
                 while 1:
                     time.sleep(1)