consider returning a different token for char than for int literals

[pzembrod]

Remains to be verified via a test, but looking at

| : atom ( -- obj )
#number# comes-a?
IF do-numatom exit THEN
#id# comes-a?
IF do-idatom exit THEN
#string# comes-a?
IF drop compile$
do-stringatom exit THEN
." a value" expected error
0 do-numatom ;

in parser.fth, it seems I have forgotten to implement character literals.

[pzembrod]

Turns out I decided to handle char constants already at the scanner level.
Still, could be worth to return a different token for char constants than for int constants, so they can be handled as 8 and not as 16 bit numbers.