Added support for proxy configs in auth flows, closes JohnnyCrazy#360

Bump Microsoft.NET.Test.Sdk from 16.1.1 to 16.2.0 (JohnnyCrazy#358)

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 16.1.1 to 16.2.0.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Commits](microsoft/vstest@v16.1.1...v16.2.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bump EmbedIO from 2.2.7 to 2.7.4 (JohnnyCrazy#344)

* Bump EmbedIO from 2.2.7 to 2.7.4

Bumps [EmbedIO](https://github.com/unosquare/embedio) from 2.2.7 to 2.7.4.
- [Release notes](https://github.com/unosquare/embedio/releases)
- [Commits](https://github.com/unosquare/embedio/commits/2.7.4)

* Update SpotifyAPI.Web.Auth.csproj

* Updated code to be compatible with EmbedIO 2.8

Added overload for NextPage stuff CursorPaging

Added vscode to gitignore

Update auth.md

Updated versions

Clear DefaultRequestHeaders when adding a new header dictionary (John…

…nyCrazy#302)

Added missing currently_playing_type field to PlaybackContext (Johnny…

…Crazy#292)

Cleanup