* indium-interaction.el: Fix xref call for Emacs 27.1.

Fix GitHub issue #204

* indium-interaction.el (indium-connect, indium-launch): Use `file-truename' to
  resolve the current directory so that the project root is set to a canonical
  directory paph.

* indium-interaction.el (indium-eval-buffer):
(indium-interaction--eval-node):
(indium-eval-region): Call `indium-interaction--handle-eval-result'.
(indium-interaction--handle-eval-result): Call the new hook.
* indium-interaction.el (indium-interaction-eval-hook): Rename the hook.

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.

The configuration has to be accessible outside of the context of the connection
to the backend, so set it globally.

When opening a connection, make sure that any previous connection is closed
first.

* indium-interaction.el: Handle closing previous connections.
* indium-chrome.el:
* indium-nodejs.el: Do not handle closing connections (this is now always done
  in indium-interaction.el).
* test/unit/indium-nodejs-test.el: Remove obsolete test.
* test/unit/indium-interaction-test.el: Add tests.

* indium-nodejs.el (indium-launch-nodejs): Rename function.
* indium-interaction.el: Fix reference.

* indium-interaction.el (indium-connect, indium-launch): New commands used for
  all backends using the .indium.json project file.

Breakpoints are tracked with `indium-breakpoint--local-breakpoints' so there is
no need to put them in the current connection anymore.

* indium-interaction.el: Running the hook after saving buffers prevents any
  annoying delay in saving buffers.

This feature should please @DamienCassou.

* indium-interaction.el (indium-switch-to-debugger): New function, bound in
`indium-interaction-mode' to C-c d.

* indium-interaction.el: Always move the point to the first column when adding a
  breakpoint, to avoid breakpoint resolution by the runtime to be on another
  line.

* indium-interaction.el (indium-eval-region): New function.
* doc/Indium.texi:
* sphinx-doc/code-evaluation.rst: Add documentation for `indium-eval-region`.

Fix `indium-add-conditional-breakpoint` to call `indium-add-breakpoint` with a
condition string.

Also add a regression test.

Fix #88

* `indium-inspect-expression`, bound to `C-c M-:`, let the user enter an
  expression to be evaluated and inspected.

Fix #85

* When saving a buffer, do the following:
  - update the script source
  - compile the script
  - update all breakpoints in the buffer

* `set-script-source' is now always performed when a buffer is saved,
  `indium-update-script-on-save' does not exist anymore.

* Update the documentation.

* Do not attempt to add a breakpoint on a line with an existing breakpoint.
* Do not attempt to remove non-existing breakpoints.

* Make breakpoints a CL struct.
* Streamline the communication between the backend and indium-breakpoint.el.
* Add unit tests.

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

* Improve REPL buffer switching

Handle loop nodes and empty expression nodes.
Fix #63

Until Indium has proper autoloads, remove the only one present in
indium-interaction.el.

* Improve REPL buffer switching

* Add a new hook `indium-update-script-source-hook` to be run after each script update.
* Add documentation for the new hook.