fix: fnameescape args for ex action

[tomtomjhj]

No description provided.

[lambdalisue]

Why?

[tomtomjhj]

Path name may contain special chars like space, %, +, etc. They have special meaning in the context of many ex commands (e.g. % gets expanded). So we should fnameescape it to avoid such interpretation.

btw vim-vinegar's · does fnameescaping too.

[lambdalisue]

Okay, it sounds good. However, in that case, I think there are few cases where fnameescape is not used, so I would like to stop tricky use of v:count and add it as a separate action if there is a demand for it. So please remove the v:count related functionality and documentation and re-implement it in a simpler form. Of course this is a destructive change, but it is close to a bug fix, so it is good.

[tomtomjhj]

fixed as suggested