* Update packages
* Convert extension methods to extension blocks
* Move extension methods closer to what they are extending
* Use ArgumentNullException.ThrowIfNull
* Move WriteAnsi and ToAnsi methods to Spectre.Console namespace
* Make shared global state obsolete
* Make AnsiConsole.Clear an extension method
* Linting should not fail build
Removed the verbs from all extension methods that manipulate
properties which makes the API more succinct and easier to read.
Also added implicit conversion from string to Style.
As a good OSS citizen, I've obsoleted the old methods with
a warning for now, so this shouldn't break anyone using
the old methods.
