Allow smart merging via expansion

[sayanarijit]

To allow merging arrays and objects via expansion, trailing comma after s and q will be auto removed after the expansion if no value is passed for the placeholder.

Example:

jf "[%(a)*s, %(b)*s]" b=2 b=1
# [2,1]

jf "{%(a)**s, %(b)**s}" b=2 b=1
# {"2":1}