Deprecate JavaConversions

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JavaConversions should be deprecated in favor of JavaConverters

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Imported From: https://issues.scala-lang.org/browse/SI-9684?orig=1
Reporter: @lrytz

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@SethTisue said:
hey community — anybody want to put together a PR for this?

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@som-snytt said:
because why should soc have all the fun?

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@som-snytt said:
scala/scala#5064 and scala/docs.scala-lang#509

Previous work on the hardest problem in computer science: scala/scala@5d555ef

The naming convention didn't quite take. Was 2012 a long time ago or like yesterday? Git history, even when not squashed, seems to flatten all time.

Why can't we do this?

import JavaConver{sions,ters}._

Quote of the day: "Initially motivated by #5580, then just motivated."

Doesn't typelevel.org offer a t-shirt that says, "Initially motivated by #2712, then just motivated."

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Kieran Tully (kieran.tully-at-gmail.com) said:
You got there before me!

See also scala/scala#5065 for minor addition to your nice work.

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@szeiger said:
Reassigning to M5. We'd probably want a change like this before the RC cycle starts.

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@som-snytt said:
Lukas suggested doc on the collection.convert._ members, which isn't done yet.

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@lrytz said:
I'm happy to do the docs work, but i'd love to get some more opinions on my proposals on scala/scala#5064.

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@som-snytt said:
scala/scala#5109