* indium-client.el (indium-client-get-completion):
* indium-repl.el (indium-repl-get-completions): Send the current stack frame as
  part of the paylod.

Fix github #167.

* indium-client.el (indium-client-evaluate): Add a FRAME parameter to
  specify which context to evaluate an expression in.
* indium-debugger.el (indium-debugger-evaluate): Add an optional FRAME
  parameter that is the current frame by default.
* indium-interaction.el (indium-eval): Use the current debugger frame
  to evaluate the passed expression.
* indium-repl.el (indium-repl-inspect): (indium-repl-evaluate): Use
  the current debugger frame to inspect and evaluate expressions.
* server/README.md: Describe the frameId parameter that the server now
  accepts for evaluation.
* server/adapters/cdp/index.js (evaluate): Accept an optional frameId
  parameter.
* server/server/runtime.js (evaluate): Accept an optional frameId
  parameter.

* indium-v8.el (indium-connection-closed-hook): New hook.
* indium-backend.el: Document the new hook.
* indium-repl.el: Call the new hook.

Most repls use these binds to navigate back and forward
on input history.

Use a separate buffer in js-mode for font-locking the user input.

Format the banner as a proper JS comment.

Make indium-repl-mode inherit from js-mode.

* Refactor all map-* calls to get/set properties of a connection.
* Extract functions to access the current connection.

* Improve REPL buffer switching