Support NO_COLOR environment variable

Closes #201

See merge request redox-os/termion!202

See <https://no-color.org/

> for more information.

Signed-off-by: Orhun Parmaksız <orhunparmaksiz@gmail.com>

Remove debug printing when parsing CSI sequences.

See merge request !201

`parse_csi` prints debug information to stdout when parsing
unsupported CSI sequences like `ESC [ 200 ~` (bracketed paste mode).

I assume this was an oversite and can be safely removed.

Update dependencies

See merge request !198

Fix logic error in Ctrl-Arrow and clean up examples

See merge request !193

Fix the changelog for 4.0.1

See merge request !192

Fix function key regression

See merge request !191

Add 4.0.0 migration guide to readme

See merge request !190

Add support for horizontal scrolling

See merge request !189

Added Ctrl/Alt/Shift+Navigation key support.

See merge request !188

`IntoRawMode`: support arbitrary TTYs

See merge request !187

Use libredox ABI on Redox.

See merge request !185

This reverts commit d96c1356, reversing
changes made to 583bb40f.