Instead of using custom path to module in lib.rs, load modules for different tty
platforms in tty/mod.rs

Terminal trait is defined in tty/common.rs where it requires
implementation of enable_raw_mode and disable_raw_mode.  readline_edit
will now move around a mutable reference to a Terminal instead of the
platform specific struct.

This reverts commit 715f658e4900cfd9a8c8f0f54a3a5cdc89c25363.

In order to support the windows platform, we will split the platform
specific logic into the tty directory.

Fix multi-line prompt.

Remove clippy dependency

Use `cargo clippy` instead.

fix musl

Release 0.2.3

Replace use of unstable features

Introduce LineBuffer component

Words

Avoid cloning by swapping.