Writing feature
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* Colour.cs:
* NftrFont.cs:
* Finf.cs:
* Program.cs: Implemented & tested write feature.
* Cglp.cs:
* Cmap.cs: Implemented write feature
* Cwdh.cs: Fixed not reading last glyph width
                     Implemented write feature
* NitroBlock.cs: Fixed problem writing char (reversed)
                             Added writing padding
* NitroFile.cs: Fixed bad written header