Port v and V to RzShell

[Rot127]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository
• I made sure to follow the project's coding style
• I've documented or updated the documentation of every function and struct this PR changes. If not so I've explained why.
• I've added tests that prove my fix is effective or that my feature works (if possible)
• I've updated the rizin book with the relevant information (if needed)

Detailed description

This brings some changes:

• Visual commands passed to V, must be given as normal argument (space between command and string).
• Changes "load layout" v [layout-name] to vl [layout-name], to have a hard distinction between v and vl.
• Change "store layout" v= [layout-name] tp vs [layout-name]. Because it is more descriptive and matches vl a little better.
• Drops the vi command for two reasons:
  • vi (open file in editor) is not at all related to the visual mode. Hence shouldn't be in the same group.
  • (Opinionated) Users can just open the file in another terminal window. Why go the extra way over Rizin?

Test plan

All green

Closing issues

...

[XVilka]

In my practice, commands like Vp, Vpp, and VP are common, maybe add some aliases for those particular cases?

[wargio]

i'm ok with these.