Add functions for configuration data handling and extend template merging capabilities

Private/Get-ConfigurationDataTemplateMergeFile.ps1

@@ -0,0 +1,42 @@
+function Get-ConfigurationDataTemplateMergeFile {
+    [CmdletBinding()]
+    Param(
+        [Parameter(Mandatory=$true)]
+        [string]
+        $Path,
+
+        [Parameter(Mandatory=$false)]
+        [hashtable]
+        $Visited = @{}
+    )
+
+    $ResolvedPath = Resolve-ConfigurationDataTemplatePath -Path $Path
+
+    if($Visited.ContainsKey($ResolvedPath)){
+        $Chain = @($Visited.Keys + $ResolvedPath) -join " -> "
+        throw "Circular configuration data template inheritance detected: $Chain"
+    }
+
+    $Visited[$ResolvedPath] = $true
+
+    $ConfigurationData = Import-PowerShellDataFile -Path $ResolvedPath
+    if($ConfigurationData -isnot [System.Collections.IDictionary]){
+        throw "Configuration data template [$ResolvedPath] must contain a hashtable."
+    }
+
+    $Files = @()
+    $BasePath = Split-Path -Path $ResolvedPath -Parent
+    foreach($ParentPath in @(Get-ConfigurationDataTemplateExtends -ConfigurationData $ConfigurationData)){
+        if([string]::IsNullOrWhiteSpace([string]$ParentPath)){
+            continue
+        }
+
+        $ResolvedParentPath = Resolve-ConfigurationDataTemplatePath -Path ([string]$ParentPath) -BasePath $BasePath
+        $Files += @(Get-ConfigurationDataTemplateMergeFile -Path $ResolvedParentPath -Visited $Visited)
+    }
+
+    $Files += $ResolvedPath
+    $Visited.Remove($ResolvedPath)
+
+    return @($Files)
+}