[Toybox] [PATCH] vi: changes to buffer drawing

[Jarno Mäkipää]

Replaced: draw_str_until with lib/crunch_str() where possible

Removed: Unused char draw functions.

Implemented: crunch_nstr() which is crunch_str with additional check
for byte length, this can be used to draw substrings or non null
terminated strings. (This can be moved to lib/ if its useful for others)

Reimplemented: Buffer drawing without line wrapping. Now too long lines are
drawn with @ in end. And cursor line scrolls left and right when hitting
right margin point. This will simplify buffer handling alot.
Linewrapping can be reimplemented later if needed but will add
complexity

Implemented: set list and set nolist ex commands, set list will show
escape codes such as tabs

Fix: Bug on splitting 2 lines, split was 1 byte off.

-Jarno

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 toys/pending/vi.c | 314 ++++++++++++++++++++++------------------------
 1 file changed, 153 insertions(+), 161 deletions(-)
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