[Toybox] [PATCH] vi.c: added v command, updated help text, Fixed memory leak in 'g' command

[Oliver Webb]

I have added the 'v' command (Which is essentially the opposite of the g[lobal] command).
Fixed a memory leak in the g[lobal] command (Freeing data while aborting)
Along with some code formatting (Replacing *(cmd+1) with cmd[1])

I have been trying to get a implementation of the s[ubsitute] command to work in vi.c.
The best I have been able to implement barely works. I know sed.c has one that does what
I am trying to do but I haven't been able to implement the algorithm that sed.c is using.

- Oliver Webb <aquahobbyist at proton.me>
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