Parse directly to numbers

[planetis-m]

No description provided.

[planetis-m]

Error: unhandled exception: Incorrect JSON kind. Wanted '{JInt}' in '' but got 'JString'. [JsonKindError]

In std/jsontutils.nim#225

[planetis-m]

for packedjson a parseNumbers = true parameter in eat and getTok can be introduced which delegates to parseNumber and guards parseNumberValue.

[planetis-m]

I suspect that nimbledata2.json in the CI had errors but with this patch it fails at:

Nim/lib/pure/json.nim

Line 930 in bfc2786

raiseParseErr(p, "{")

instead of raising ValueError. CI pass will prove that.