Fixed Width Font

The Textpane gadget definition has a new keyword 'FixChars' to force the use of a fixed width font.

This allows the text pane to be used to show simple reports laid out using the space character.

The chosen font is Courier New (TrueType), because it has a reasonable selection of character glyphs (nowhere near as extensive as the default variable width font Arial Unicode MS).

                       .--------<--------.

                      /                  |

>-- TEXTPane gname --+-- tagtext---------|

                     +-- <fganch> -------|

                     +-- <fgdock> -------|

                     +-- <fgpos> --------|

                     +-- FIXCHARS -------|

                     +-- CORE -----------* Core managed gadget

                     '-- <vshap> --->