PROPOSAL enhance REPL window handling

[cfehse]

What has Changed?

• src/connector.ts
  • Moved code to create/show the REPL windows into a seperate function.
  • Improved error checking during the connect sequence.
• NReplEvaluation in nrepl/index.ts
  • Enhanced the class to contain all message parsing.
  • Added properties which contain all information about the evaluation on resolve/reject.
  • Store any normal and error output of the evaluation for later use.
  • Retrieve the stacktrace of an exception before reject the promise.
  • Make sure that a running evaluation will be correctly rejected during interruption.
  • Added mechanism to interrupt all running evaluations at once.
  • Added mechanism to provide generic user input for evaluations not running in the REPL window.
• functions eval() and loadfile() in nrepl/index.ts
  • Delegate message parsing and resolve/reject to the NReplEvaluation class to ensure both methods behave identical.
• repl-window.ts improved reconnect sequence
  • Use the NReplEvaluation class to retrieve error output and display it in the REPL window. Unfortunately with will not show errors on the first connect with shadow-cljs because the repl needs some time to initialize completely and show the error during eval. I the REPL window is closed and reopened the error is shown on reconnect. This is maybe better than nothing. gg

• Added mechanism to add history entries which will not pollute the history. Identical evaluation run many time in a row will only be added once.
• Added commands to clear the REPL windows
  • Added a command per REPL type.
  • Clear the history of the REPL window and clear the content in the webview.
• Add robust support for evaluation interruption (ctrl+d - see [Feature request] Allow interruption of execution #237)
• Added support for read-line from the REPL window ( see clojure.core/read-line doesn't work in Calva REPL #377) and in the editor.
• Added command "Interrupt running Evaluations" (ctrl+alt+c ctrl+alt+d) to interrupt all running evaluations in editors and REPL windows.
• Made the message handling and evaluation in the REPL window completely asynchronous (removed all unnecessary async/awaits).

My Calva PR Checklist

I have:

• Read How to Contribute.
• Made sure I am directing this pull request at the dev branch. (Or have specific reasons to target some other branch.)
• Made sure I am changed the default PR base branch, so that it is not master. (Sorry for the nagging.)
• Tested the VSIX built from the PR (well, if this is a PR that changes the source code.) You'll find the artifacts by clicking Show all checks in the CI section of the PR page, and then Details on the ci/circleci: build test. (For now you'll need to opt in to the CircleCI New Experience UI to see the Artifacts tab, because bug.)
  • Tested the particular change
  • Figured if the change might have some side effects and tested those as well.
  • Smoke tested the extension as such.

Before merging we (at least one of us) have:

• Made sure the PR is directed at the dev branch (unless reasons).
• Read the source changes.
• Given feedback and guidance on source changes, if needed. (Please consider noting extra nice stuff as well.)
• Tested the VSIX built from the PR (well, if this is a PR that changes the source code.)
  • Tested the particular change
  • Figured if the change might have some side effects and tested those as well.
  • Smoke tested the extension as such.
• If need be, had a chat within the team about particular changes.

Ping @PEZ, @kstehn, @cfehse