[antlr-interest] Added ranges, escapes to [a-z] notation in lexer to honey badger

[Gavin Lambert]

At 09:04 23/01/2012, Terence Parr wrote:
 >Hi. grab another update. augmented [
] in lexer:
 >a-z is the inclusive range
[...]
 >    Inverted ranges give nothing

Why's that?  I would have thought that this:
   ~[a-c]
ought to be the same as this:
   ~('a'|'b'|'c')
...?

Granted in most cases you can use . instead of 
inverted ranges, but it could be useful to be more specific.