v0.10.0 Plotly, VSCode, Cell Magic

0.10.0, 2024/04/07 Improvements on Plotly, VSCode support, Cell magic, interrupt handling and several minor fixes.

• Added special cell commands ("magic"):
  • %%writefile to write contents of cell to file. See #103. Thanks @potoo0!
  • %%script, %%bash and %%sh to execute the full cell contents with the given command (none of the extra flags are supported yet though).
• Added dom.LoadScriptOrRequireJSModuleAndRun and dom.LoadScriptOrRequireJSModuleAndRunTransient that dynamically decides
  if to include script using <script src=...> or use RequireJS.
• Plotly library uses dom.LoadScriptOrRequireJSModuleAndRun now, allowing result to show up in the HTML export of
  the notebook.
• Added plotly.AppendFig that allows plotting to a transient area, or anywhere in the page.
• Several minor fixes, see #106
• Added handling of SIGHUP and SIGTERM to handle a clean exit: and avoid leaking gopls daemons.
• Make sure SIGINT triggers an equivalent SIGINT on the child processes (it was not happening in VSCode).
• Added docs/VSCode.md with notes/info on running GoNB with Visual Studio Code.