Some warnings

[dannywillems]

I fixed some warnings, see PRs (#234, #235, #236, #237, #238), but there are still some:

In copilot--handle-notification:
copilot.el:469:14: Warning: ‘mark-whole-buffer’ is for interactive use only.

In end of data:
copilot.el:597:14: Warning: the function ‘vterm-insert’ is not known to be
    defined.
copilot.el:596:14: Warning: the function ‘vterm-delete-region’ is not known to
    be defined.

Emacs 29.1

[emil-vdw]

@dannywillems thanks for all the contributions! 🎉

[jcs090218]

All warnings have been addressed in #287.