Installer scripts updates

Update dotnet-install scripts to the latest versions: #270

Support for installation of multiple versions, warnings for deprecated versions

This release includes the following PRs:

• Adding support to install multiple .NET versions in single action invocation: #240
  example:

- uses: actions/setup-dotnet@v1
  with:
    dotnet-version: | 
      3.1.x
      5.0.x

The latest installed .NET version is default, according .NET documentation.

• Adding the build warnings if the deprecated .NET versions are installed by action: #245

Package Updates, Improvement for global.json handling

• Bump path-parse from 1.0.6 to 1.0.7 #222
• Update installer scripts #226
• Support rollForward option for global.json #224

Update packages

• Bump ws from 7.3.1 to 7.5.0 #212
• Bump hosted-git-info from 2.8.8 to 2.8.9 #198
• Bump lodash from 4.17.20 to 4.17.21 #197
• Bump node-notifier from 8.0.0 to 8.0.1 #158
• Update installers scripts #204

Support of preview versions, input validation improvements and other bug fixes

This release includes the following PRs:

• Add include-prerelease input to be able to match latest prerelease versions #110
• Support various nuget.config name formats #188
• Add workaround to fix BOM-related error during parsing global.json #192
• Improve key names validation from user' nuget config #187
• Fix for 5.x notation #175

Package Updates

Update @actions/core Version and move towards uses environment file

Side-by-Side Installation

Bug fixes for DOTNET_ROOT and generic dotnet versions

Side-by-Side Installation

Allow side-by-side installation of multiple versions of dotnet. Also, also uses the preinstalled versions of dotnet on virtual-environments.

Bug fix for nuget.config file and various package updates.

License and documentation updates

Adding module licenses. Minor updates to scripts and documentation including readme examples to use main branch.

Follow proxy settings and use wildcard for patch versions

Follows self-hosted runner proxy settings

Also introduces a wildcard for a patch version, allowing 3.1.x to install the latest release.