R0 = 0 to unshade 'System font' entry, 1 to shade it
R1 = Pointer to menu title (12 chars max), or 0 for 'Font'
Exit:
R1 = Pointer to menu structure
Reads in the list of fonts currently available and create
a hierarchial menu structure with all the fonts listed by
family. 'System font' is also on the root menu. This menu
structure is guaranteed to remain in the same place for as
long as your task is active. The font list MAY be read in
the first time you call WimpExt_GetFontMenu, or it may
have been read in earlier. This SWI may only be called if
you set bit 2 of R2 when you called WimpExt_Initialise.
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