JLine 3: turn Som's old checklist into tickets

[SethTisue]

on ye olde JLine 3 PR, @som-snytt had this checklist:

• Backend, nail down interface and protocol
• Colorization https://github.com/scala/scala-dev/issues/687
• Excise old continuation handling
• History and related features https://github.com/scala/scala-dev/issues/690
• Compile to functions, frontend manages inputs
• Coursier convenience (I guess this is "magic imports (ivy dependencies etc)" at REPL: Improved REPL #325)
• Hook up -x formatting and contribute to jline
• Fix // print JLine 3: fix //print #692
• Support camel-cased, anagram-style completion as previously https://github.com/scala/scala-dev/issues/691

We need to march down this list and figure out what was already fixed, and for the rest, make tickets here

[SethTisue]

None of these look like 2.13.2 blockers to me, but I'd like to know what @som-snytt thinks — Som, can you provide descriptions for these?

[SethTisue]

"Coursier convenience", does that refer to pulling in dependencies at runtime? that'd be awesome, but not a blocker of course

UPDATE: I'll assume that, and it's covered under #325

[SethTisue]

"Excise old continuation handling", finally figured out that "continuation" refers to multiline support. So I guess there's old code related to how we used to do that, that we can delete now that JLine supports it directly

UPDATE: but I found later that ReplTest still does it the old way

[SethTisue]

Excise old continuation handling

the old code is causing actual trouble at #703

[SethTisue]

the old code is causing actual trouble at #703

false alarm.

I'm going to close this, since nothing further that's obviously actionable has surfaced.