bug#41858: 28.0.50; [PATCH]: Make project-shell use universal argument

[Theodor Thornhill]

Hello,

Attached is a patch to change the default behaviour of 'project-shell'.

My use case is:

- Edit some file in some project.
- 'M-x project-shell'
- Do something, then "C-x 0"
- Oops forgot to read output.
- 'M-x project-shell'
- See the same buffer.

Right now 'project-shell' opens a new buffer every time it is invoked. Now I 
have to find it in the buffer list. Putting previous behaviour on universal 
argument will in addition enable this workflow

- Edit some file in some project.
- 'M-x project-shell'
- 'C-u M-x project-shell'
- Now emacs is split it two, with two separate shell processes


In addition, I let default name be *'project-root-dir'-shell* to signify this 
shell buffer to be unique from other shell buffers invoked by 'M-x shell'.

All the best,
Theodor Thornhill

project-shell
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