This implements:
- console.group()
- console.groupCollapsed()
- console.groupEnd()
In the Browser, we use `<details>` for the groups, which is not actually
implemented yet, so groups are always open.
In the REPL, groups are non-interactive, but still indent any output.
This looks weird since the console prompt and return values remain on
the far left, but this matches what Node does so it's probably fine. :^)
I expect `console.group()` is not used much outside of browsers.
The console widget now requests messages and receives them in bulk,
using the shiny new IPC calls. This lets it display console messages
that occurred before the widget was created. :^)
Instead of building the web DOM by hand, we now load an empty document
into an OutOfProcessWebView, and then append things to it by sending
little snippets of JavaScript to the host process. :^)
SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
Added input hook into console widget to allow input to be captured and
sent to the external JS console via IPC.
Output from the external JS console is fed into the console widget
via handle_js_console_output().
