Contains common classes used by Providers.

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	Class	Description
	DefaultProvider	Default implemetation for the IProvider interface.
	DummyProvider	Empty provider which doesn't load anything.
	MapType	MapType class provides the default implemetation of the IMapType interface.
	Providers	This class defines built-in classes of the tile providers that can be used in UMap.
	TileLayer	TileLayer class provides the default implemetation for the ITileLayer interface.
	XMLProvider	Base class that provides mechanism to load provider settings via XML file.