Splash screen

This window is used for... nothing, actually. But it looks cool. It can be disabled (Main window -> options tab -> Player's name options) if user decides to.

There are two types of splash screen:
 * Connection window - contains information about, that to which server player will be connected to and which name (if any) will be assigned to player by application.
 * Launching demo window - contains information about a demo, that will be displayed using cod4 client.