[BRLTTY] Text table syntax change.

[Dave Mielke]

Text tables now support both local and Unicode characters. A character in the 
local character set is defined via the "byte" directive, and a Unicode 
character is defined via the "char" directive. For convenience, the "byte" 
keyword has been optional until now. With the introduction of Unicode character 
support, starting off a character definition line with the character value, 
i.e. with no keyword identifying the action to be taken, has become ambiguous 
so that shortcut is no longer recognized. For example:

   \x61 (1) # This syntax is no longer supported.
   byte \x61 (1) # This defines a character in the local character set.
   char \x61 (1) # This defines a Unicode character.

This change is effective as of revision 3845. All of BRLTTY's text tables have 
been converted. Your personal text tables, however, may need to be updated.

-- 
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