Add jq autocomplete / more helpful errors / error arrows

[Wazzaps]

No description provided.

[systemmonkey42]

Remember to allow custom macros (from ~/.jq and ~/.jq/*) to be autocompleted.

My ~/.jq directory contains about 150 custom macros (~800 lines of JQ) and autocomplete would be awesome.

Example macro - actual formatting.

# Convert the input integer to a string in the specified base (2 to 36 inclusive)
def convert(base):
  def stream:
    recurse(if . > 0 then ./base|floor else empty end) | . % base ;
  if . == 0 then "0"
  else  [stream] | reverse | .[1:]
  | if   base <  10 then map(tostring) | join("")
    elif base <= 36 then map(if . < 10 then 48 + . else . + 87 end) | implode
    else error("base too large")
    end
  end;

[dufferzafar]

@systemmonkey42 Are your jq macros on GitHub somewhere? Would love to see what sort of things people use it for!