[BRLTTY] Improving the speech support of brltty

[Dave Mielke]

The latest code now has the following commands. To save on complexity, all need 
KPPlus held, and shifted means KPPlus+KP0. Please let me know what's missing.

   123: previous character, current character, next character
   456: previous word, current word, next word
   789: previous line, current line, next line
   Slash: route system cursor to speech location
   shift 123: first non-blank char, describe current char, last non-blank char
   shift 5: spell current word
   shift 79: first non-blank line, last non-blank line
   shift Slash: speak current location

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