Add missing signal/slot connection for adding a server from direct connect dialog.
Refactor utility functions.

Add functions for parsing player counts and servers from NWN server datagram.
Add function to scan string for web address.
Add function for sanitizing names.
Refactor table model to ping servers directly after the master server list is loaded.

* The master server is still used to add unknown servers.
* Servers in history that aren't on the master server list should show up automatically.