[Debugger] Improve debugging of symbol used as a 0 arg block

[jecisc]

It is possible to use symbols as 0 arg block like this:

#(1 2 3 4) select: #even

One of the only thing I do not like with this feature (personally, because I know some people don't like this for other reasons ahah) is that it is harder to debug.

In order to improve that it might be nice to be able to do a Through on a symbol and if it receive "value" at some point, we could end up in the code of this method equivalent to the symbol.