[Toybox] [PATCH] Addition of the 'g' command to vi.c

[Oliver Webb]

Heya, I added the 'g' ex command to vi
The only problem with it that I see is (also a problem in cslpit with /regex/ rules) 
that it doesn't read escaped regexp's because 
sscanf(); doesn't work like that and I haven't found a simple solution to reading 
escaped strings up until a delimiter (except when that delimiter is escaped)

The only reason this command took so long to implement is because I had some errors
that turned out to be caused by uninitialized memory. 

I would write some test cases to go with this command, but I already have a pending patch
for other test cases that I have added and I didn't want to have a conflict
between the 2 patches 

Also, In the error message handling, I replaced "sleep(1);" with "(void)getchar();".

- Oliver Webb <aquahobbyist at proton.me>
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