Improve interactive user experience

[felixfbecker]

This finally implements improvements I proposed to Trevor over a year ago in person. The theme of this PR is to improve the experience when using PSGitHub interactively in a terminal.

This includes:

• Autocompletion for parameters
• Beautiful, colored output formatting with multiple views for issues, PRs, labels, comments, commit statuses, milestones
  • As part of this, adds type names for all result objects and removes classes
  • Also renders markdown in issue bodies and comments
• Better error messages
• Pipeline support and interop with PowerGit. This enables a workflow to locally create a new branch, push it and directly open a PR for that branch all in one line through piping.
  • This meant adding ValueFromPipelineByPropertyName to parameters, aliases to match property names and using process blocks everywhere
• Automatic pagination. This means you don't have to supply -Page, PSGitHub will just keep streaming new pages until you got what you were looking for. Users can use Select-Object -First to limit the results (and not make too many API requests), or Ctrl+C to abort.
• New cmdlets:
  • Add-GitHubAssignee
  • Find-GitHubIssue
  • Find-GitHubLabel
  • Find-GitHubUser
  • Get-GitHubCombinedCommitStatus
  • Get-GitHubIssueTimeline
  • Get-GitHubOrganization
  • Get-GitHubProject
  • Get-GitHubProjectCard
  • Get-GitHubProjectColumn
  • Get-GitHubPullRequest
  • Get-GitHubRateLimit
  • Get-GitHubTeam
  • Get-GitHubTeamMember
  • Get-GitHubUser
  • Merge-GitHubPullRequest
  • Move-GitHubProjectCard
  • New-GitHubProjectCard
  • New-GitHubReview
  • New-GitHubReviewRequest
  • Remove-GitHubAssignee
  • Remove-GitHubGitRef
  • Submit-GitHubReview
  • Update-GitHubIssue
  • Update-GitHubUser
• New parameters for existing cmdlets:
  • Support all options in New-GitHubRepository
  • -MilestoneName and -Draft for New-GitHubPullRequest
  • -TeamAssignees for New-GitHubPullRequest, Update-GitHubIssue
• Rename Set- cmdlets to Update- as that name is more intuitive (aliaseed for BC)
• Gist files property is now a hashmap instead of object
• Rename New-GitHubFork to Start-GitHubFork as the process is async (aliased for BC)
• Add documentation for all these features, including SVG screenshots
• Fixed a lot of PSScriptAnalyzer warnings and updated PSScriptAnalyzer

New rendered README with screenshots: https://github.com/pcgeek86/PSGitHub/blob/interop/README.md