The glyph set is written out to file for processing

|SOURCE|
[FontWidget]
* Added new structs to facilitate writing the glyphs metadata to disk
* Added a member variable for holding the glyphs to be written to disk
* Added a member function to write the glyphs to disk
* The constructor takes an optional extra parameter to specify the font's point
  size (default is 16)
* ASCII characters from '0' to 'z' are rendered
* the glyph information to be written to disk is added when rendering the
  glyphs