[Toybox] [PATCH] vi: unalloc used memory, cleanups, fixes

[Jarno Mäkipää]

add: linelist unload
fix: proper utf8 handling on insert mode backspace
fix: free allocated data at exit
cleanup: rename some variables to be describive but short
cleanup: reorganize some variables in main
---
 toys/pending/vi.c | 406 ++++++++++++++++++++++++----------------------
 1 file changed, 208 insertions(+), 198 deletions(-)
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