Added script for rename to Avalonia.

scripts/avalonia-rename.ps1

@@ -0,0 +1,62 @@
+function Get-NewDirectoryName {
+    param ([System.IO.DirectoryInfo]$item)
+
+    $name = $item.Name.Replace("perspex", "avalonia")
+    $name = $name.Replace("Perspex", "Avalonia")
+    Join-Path $item.Parent.FullName $name
+}
+
+function Get-NewFileName {
+    param ([System.IO.FileInfo]$item)
+
+    $name = $item.Name.Replace("perspex", "avalonia")
+    $name = $name.Replace("Perspex", "Avalonia")
+    Join-Path $item.DirectoryName $name
+}
+
+function Rename-Contents {
+    param ([System.IO.FileInfo] $file)
+
+    $extensions = @(".cs",".xaml",".csproj",".sln",".md",".json",".yml",".partial",".ps1",".nuspec",".htm",".html",".gitmodules")
+
+    if ($extensions.Contains($file.Extension)) {
+        $text = [IO.File]::ReadAllText($file.FullName)
+        $text = $text.Replace("perspex", "avalonia")
+        $text = $text.Replace("Perspex", "Avalonia")
+        $text = $text.Replace("PERSPEX", "AVALONIA")
+        [IO.File]::WriteAllText($file.FullName, $text)
+    }
+}
+
+function Process-Files {
+    param ([System.IO.DirectoryInfo] $item)
+
+    $dirs = Get-ChildItem -Path $item.FullName -Directory
+    $files = Get-ChildItem -Path $item.FullName -File
+
+    foreach ($dir in $dirs) {
+        Process-Files $dir.FullName
+    }
+
+    foreach ($file in $files) {
+        Rename-Contents $file
+
+        $renamed = Get-NewFileName $file
+
+        if ($file.FullName -ne $renamed) {
+            Write-Host git mv $file.FullName $renamed
+            & git mv $file.FullName $renamed
+        }
+    }
+
+    $renamed = Get-NewDirectoryName $item
+
+    if ($item.FullName -ne $renamed) {
+        Write-Host git mv $item.FullName $renamed
+        & git mv $item.FullName $renamed
+    }
+}
+
+& git submodule deinit .
+& git clean -xdf
+Process-Files C:\projects\Perspex