* `write_cout!` returns number of written bytes
* `Terminal::write` returns number of written bytes (result of `write_cout!`)
* `execute!` macro is a bit simpler
* Remove unused `std::io::Write` imports
- Major refactor and cleanup.
- Improved performance;
- No locking when writing to stdout.
- UNIX doesn't have any dynamic dispatch anymore.
- Windows has improved the way to check if ANSI modes are enabled.
- Removed lot's of complex API calls: `from_screen`, `from_output`
- Removed `Arc<TerminalOutput>` from all internal Api's.
- Removed termios dependency for UNIX systems.
- Upgraded deps.
- Removed about 1000 lines of code
- `TerminalOutput`
- `Screen`
- unsafe code
- Some duplicated code introduced by a previous refactor.
- Raw modes UNIX systems improved
- Added `NoItalic` attribute
