feat: Elixir 0.10.0 package first release

- ensure Erlang and toolsroot are installed
 - add bin directory to PATH
 - uninstall removes Elixir from tools directory and removes PATH mods

Elixir/tools/chocolateyUninstall.ps1

@@ -0,0 +1,35 @@
+$package = 'Elixir'
+
+try {
+  $location = Join-Path $Env:SystemDrive $Env:Chocolatey_Bin_Root
+  if (!(Test-Path $location))
+  {
+    $location = Join-Path $Env:SystemDrive 'tools'
+  }
+  $location = Join-Path $location $package
+
+  if (Test-Path $location)
+  {
+    Remove-Item $location -Recurse -Force
+  }
+
+  $binLocation = (Join-Path $location 'bin') -replace '\\', '\\'
+
+  $userPaths = [Environment]::GetEnvironmentVariable('Path', 'User') -split ';' |
+    ? { ($_ -notmatch $binLocation) -and (![String]::IsNullOrEmpty($_)) } |
+    Select-Object -Unique
+
+  [Environment]::SetEnvironmentVariable('Path', ($userPaths -join ';'), 'User')
+
+  Write-Host @'Please restart your current shell session to access Elixir commands:
+  elixir
+  elixirc
+  mix
+  iex.bat (use batch file within Powershell due to name collision)
+  '@
+
+  Write-ChocolateySuccess $package
+} catch {
+  Write-ChocolateyFailure $package "$($_.Exception.Message)"
+  throw
+}