Adapt existing UI screens to use NUI

[BenjaminAmos]

As part of #455, the existing built-in UI system is being replaced with the NUI framework from Terasology. This issue tracks the progess made in adapting all of the existing screens to use NUI.

• [ ] TutorialManager (#670 - Moved to `Tutorial Screen)
• [X] CreditsScreen (#631)
• [X] ConsoleScreen (was done as part of #536)
• [ ] InventoryOperationsScreen and its sub-classes (#668)
• [X] LoadingScreen (#631)
• [X] NewGameScreen (#631)
• [ ] MenuScreen (#666)
• [ ] WaypointCreationScreen (#669)
• [X] ResolutionScreen (#631)
• [ ] TalkScreen (#667)
• [X] NewShipScreen (#631)
• [X] OptionsScreen (#631)
• [X] MainMenuScreen (#631)
• [ ] MapScreen (#669)
• [X] InputMapScreen (#631)
• [ ] InventoryScreen (#668)
• [ ] MainGameScreen (see #588 for a partial port and #665 for the rest)