git related improvements and implementations

+ Get-GitRepo - Clone or update a repo, with tag support
+ Get-GitHubReleaseTag - Grab tag from latest release page
+ Refresh-GitRepo - Stage all possible changes, discarding any
previously stageds changes
= GitHub repo is now git repo - as some code isn't GitHub specific
+ cat Alias for Get-Content
= Get-PossiblArguments improvement
= Invoke-WebDownload fix
= dcedit fixing bad argument processing

git/Refresh-GitRepo.ps1

@@ -0,0 +1,7 @@
+$local:workTree = git worktree list --porcelain | Select-String worktree | ForEach-Object { $_ -split 'worktree ' } | Where-Object { $_ }
+Push-Location $workTree
+$null = git reset HEAD
+$null = git rm --cached -r .
+$null = git add .
+git status
+Pop-Location