[Toybox] [PATCH] clear.c: Clear scrollback buffer on non-vte (gnome based) terminals

[Mouse]

> "\ec" is supported by linux ttys, and clears the screen in all
> terminals I tested.  And "\e[3J" has been supported by linux since
> 3.0, and clears the scrollback buffer in every terminal I've tested
> that has one, and is a NOP for terminals without one like linux tty's
> or st

What about terminals - and emulators - that don't do X3.64?  ESC does
nothing for me, so \e[3J would display as [3J.

Or do you simply not care about portability to that extent?

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