Cellbuf new acurses renderer #299
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This will use vt100 sequences when the terminal is not xterm-like and xterm and ECMA-48 sequences when it is.
the correct cells when updating the line
With this change, `cellbuf.Screen` manages alternate screen buffer and cursor visibility. The `Screen` struct now has `EnterAltScreen`, `ExitAltScreen`, `ShowCursor`, and `HideCursor` methods. The `Screen` struct also has `SetRelativeCursor` method to set relative cursor movements which is used in inline mode.
This method allows inserting strings above the screen. The inserted strings are not managed by the screen and are not part of the buffer.
Otherwise, we might incorrectly append to the queue while it's being processed.
We shouldn't write beyond the width of a wide cell placeholder.
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