* Image.cs: Changed internal data array to one-dimension to make
  public LinealCodec and make easy changes

* Map.cs: Finished palette index support
Flip implementation
* Nscr.cs: Added NSCR file format

* Image.cs: Remove checks in dimensions fields since PixelEncoding is
  set later in SetData
* Image.cs: Fixed bug

* Map.cs: MapInfo ushort value is used by many other formats, useful
  to be there.

* Nscr.cs: Cleaning code

* Program.cs: Map file test.
* Map.cs: Added BG Modes support.
* Nscr.cs: Figured out unknown fields: BG mode and Palette mode
                   Support for Affine mode
* Program.cs: Updated map info
* Importer.cs: Class to import images and create nitro files.
* Map.cs: Added create map from array of pixels.
* Ncgr.cs: Public accessor to create NCGR files.
* Nclr.cs:  Public accessor to create NCLR files.
* Nscr.cs: Public accessor to create NSCR files.