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 (Convert TutorialScreen to NUI #670 - Moved to `Tutorial Screen)
• CreditsScreen (Adapted Main Menu screens to use NUI #631)
• ConsoleScreen (was done as part of Initial Integration of NUI (Relates to #455) #536)
• InventoryOperationsScreen and its sub-classes (Convert the inventory screen (and all InventoryOperationsScreen screens) to NUI #668)
• LoadingScreen (Adapted Main Menu screens to use NUI #631)
• NewGameScreen (Adapted Main Menu screens to use NUI #631)
• MenuScreen (Convert the in-game menu to NUI #666)
• WaypointCreationScreen (Convert MapScreen and WaypointCreationScreen to NUI #669)
• ResolutionScreen (Adapted Main Menu screens to use NUI #631)
• TalkScreen (Convert the talk screen to NUI #667)
• NewShipScreen (Adapted Main Menu screens to use NUI #631)
• OptionsScreen (Adapted Main Menu screens to use NUI #631)
• MainMenuScreen (Adapted Main Menu screens to use NUI #631)
• MapScreen (Convert MapScreen and WaypointCreationScreen to NUI #669)
• InputMapScreen (Adapted Main Menu screens to use NUI #631)
• InventoryScreen (Convert the inventory screen (and all InventoryOperationsScreen screens) to NUI #668)
• MainGameScreen (see Partially adapted MainGameScreen to use NUI #588 for a partial port and Convert remaining MainGameScreen visuals to NUI #665 for the rest)