simple toString for Tuple!()s

[dlangBugzillaToGithub]

black80 reported this on 2019-09-19T06:49:09Z

Transfered from https://issues.dlang.org/show_bug.cgi?id=20228

Description

Tuple!() prints like 
> Tuple!(type, name, type, name, type, name)( val, val, val )
too many spam for it. 
not types printing for structs by default, so why it need here?

better solution:
for named values to print with names, for unnamed - just value
> (name1=val, name2=val, val)
or simpler
> (val, val, val)
cuz for structs (by default) no names too