Add more symbols for bounds of %Q, and others

[kostya]

in ruby this is ok:

%Q|a|

in crystal not compiled.

this is usefull when want for example write json as string: this is not readable %Q[{"a":[1,2,3]}] and %Q{{"a":[1,2,3]}}, but this ok: %Q|{"a":[1,2,3]}|

[asterite]

This was discussed in #1598

You could use %Q<{"a":[1,2,3]}>, though now I changed my mind about this subject and probably | looks/reads good for us to add it to the language.

[kostya]

also about inspecting strings.
in specs for example it outputted like this, not readable:

       expected: "{\"result\":0,\"something\":2}"
       got: "{\"result\":0,\"something\":1}"

this is better, imho:

       expected: %q|{"result":0,"something":2}|
       got: %q|{"result":0,"something":1}|