In order to be consistent with the rest of the naming scheme, and in order to avoid conflicts with the higher level rust wrappers, which will be using `Notcurses` for the wrapper struct from now on.
- also deprecate `NotcursesOptions` and rename it to `NcOptions`.
- update examples, docs and readme.
- remove `Nc` & `NcD` wrappers, to move them to notcurses-rs library.
- update the summary header format for Notcurses and NcDirect
- update docs and examples
- raw field of new wrapping structs is now public just to the crate.
- NcNotcurses.stdplane method now doesn't return an NcResult since it can't fail.
- rename NcNotcurses to Notcurses and NcNotcursesOptions to NotcursesOptions.
- rename NcPlane::new_termsize constructor to with_termsize.
- bump MSV to 1.48 for the doc links.
- improve lib documentation.
- minor fixes.
- new example poc-menu (WIP).
- improve constructors for NcMenu*.
- divide NcMenu* methods into submodules.
- fix return type for NcPlane constructors.
- use NcResult on functions returning references.
- fix a couple of Notcurses methods.
- add more NcChannelPair methods.
- refactor NcInput constructors.
- rename error_ptr![] to error_ref_mut![]
- new macro cstring_mut![].
- new error_ref![] macro.
- update examples & tests.
- bump version in readme.
- change Option return type for NcResult when appropriate.
- make NcDirect constructors return NcResult.
- rename NcError::new() to with_msg() and simplify new().
- refactor examples:
- rename direct-image.rs to direct-image-c.rs
- recreate using rust methods, as direct-image-rust.rs
- differentiate more throughly between both styles.
- remove the sys namespace on both examples.
- Preparing to host the documentation in the github pages, at least until
- libnotcurses-sys can get into Ubuntu 20.
- fix Cargo.toml, add documentation link.
- update documentation link in README.
- improve lib doc comment, among others.
- make a little change to ensure MSRV 1.40.0
- show MSRV (Minimum Supported Rust Version) in README
- show up-to-date state of crate dependencies in README
- update comments
