New line after imports

[ov7a]

Apparently, this is a valid Kotlin code:

package foo.bar.goo import foo import foo.bar import foo as bar import foo.bar as bar import foo.*import foo.*

This is the output from this test case in CorpusParseAndWriteWithExtrasTest:

package foo.bar.goo

import foo
import foo.bar
import foo as bar
import foo.bar as bar
import foo.*
import foo. *

However, it is quite counter-intuitive and not very user-friendly to have this kind of output.

It would be nice to have a convenient way to write imports in a human-readable way.
I can image two possible ways to the solution:
a) patch the Writer to always produce a new line after import
b) provide a convenient helper to create a new import/wrap old imports with new lines.

Let me know what you think. I can open a PR to fix that.