Moved release management scripts to dedicated 'OneFlow' folder

OneFlow/Finish-Feature.ps1

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+param($featurename)
+
+. .\buildutils.ps1
+$buildInfo = Initialize-BuildEnvironment
+
+# feature branch merges must only be pushed from a repository with the official GitHub repository as the origin remote.
+$remoteUrl = git ls-remote --get-url
+if( $remoteUrl -ine "https://github.com/UbiquityDotNET/Llvm.NET.git" )
+{
+    throw "Publishing a release tag is only allowed when the origin remote is the official source release current remote is '$remoteUrl'"
+}
+
+$featureBranchName = "feature/$featureName"
+git checkout $featureBranchName
+git pull
+git rebase -i develop
+git checkout develop
+git merge --ff-only $featureBranchName
+git push origin develop
+git branch -d $featureBranchName
+git push origin --delete $featureBranchName

OneFlow/Publish-Release.ps1

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+. .\buildutils.ps1
+$buildInfo = Initialize-BuildEnvironment
+
+# determine release tag from the build version XML file in the branch
+[xml]$buildVersionXml = Get-Content .\BuildVersion.xml
+$buildVersionData = $buildVersionXml.BuildVersionData
+$preReleaseSuffix=""
+if(![string]::IsNullOrWhiteSpace($buildVersionData.PreReleaseName))
+{
+    $preReleaseSuffix = "-$($buildVersionData.PreReleaseName)"
+    if(![string]::IsNullOrWhiteSpace($buildVersionData.PreReleaseNumber))
+    {
+        $preReleaseSuffix += ".$($buildVersionData.PreReleaseNumber)"
+        if(![string]::IsNullOrWhiteSpace($buildVersionData.PreReleaseFix))
+        {
+            $preReleaseSuffix += ".$($buildVersionData.PreReleaseFix)"
+        }
+    }
+}
+
+# Release tags must only be pushed from a repository with the official GitHub repository as the origin remote.
+# This ensures that the links to source in the generated docs will have the correct URLs
+# (e.g. docs pushed to the official repository MUST not have links to source in some private fork)
+$remoteUrl = git ls-remote --get-url
+
+Write-Information "Remote URL: $remoteUrl"
+
+if($remoteUrl -ine "https://github.com/UbiquityDotNET/Llvm.NET.git")
+{
+    throw "Publishing a release tag is only allowed when the origin remote is the official source release current remote is '$remoteUrl'"
+}
+
+# pushing the tag to GitHub triggers the official build and release of the Nuget Packages
+$tagName = "v$($buildVersionData.BuildMajor).$($buildVersionData.BuildMinor).$($buildVersionData.BuildPatch)$preReleaseSuffix"
+$releaseBranch = "release/$tagName"
+$currentBranch = git rev-parse --abbrev-ref HEAD
+if( $releaseBranch -ne $currentBranch )
+{
+    throw "Current branch '$currentBranch' doesn't match the expected release branch from BuildVersion.xml, expected '$releaseBranch'"
+}
+
+$localCommitSha = git rev-parse --verify $releaseBranch
+$remoteCommitSha = git rev-parse --verify "origin/$releaseBranch"
+if( $localCommitSha -ne $remoteCommitSha )
+{
+    throw "Local HEAD is not the same as origin, these must be in sync so that only the tag itself is pushed"
+}
+
+git tag -a $tagname -m "Official release: $tagname"
+git checkout develop
+git merge $releaseBranch
+git push --tags origin develop
+git branch -d $releaseBranch
+git push origin --delete $releaseBranch
+
+# update master branch to point to the latest release for full releases
+git checkout master
+git merge -ff-only $tagName
+git push

OneFlow/ReadMe.md

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+# GIT OneFlow support scripts
+The scripts in this folder are used for release and feature branch management.
+This repository follows the [OneFlow](https://www.endoflineblog.com/oneflow-a-git-branching-model-and-workflow#develop-finishing-a-release-branch)
+model and workflow. With one active long term branch 'develop'. (The master
+branch is present and long term but is not active, it only points to the latest
+official release (including preview releases) of the project. This is a convenience
+to allow getting the latests released source quickly. Generally the scripts used here
+are only for release managers with direct push permissions to the repository and are
+not generally required for most contributors.