Add QuickTime 7 (#3466)

* Despite a newer version of QuickTime Player, v10.4,
QuickTime Player 7 is still a requirement for many
professional media software.

* removed comment

* version interpolation

Casks/quicktime-player7.rb

@@ -0,0 +1,14 @@
+cask 'quicktime-player7' do
+  version '7.6.6'
+  sha256 '954c2376d2d747821614dc802249cf3c708a4792abed08945d7261de3894e759'
+
+  url "http://support.apple.com/downloads/DL923/en_US/QuickTimePlayer#{version}_SnowLeopard.dmg"
+  name 'QuickTime Player 7'
+  homepage 'https://support.apple.com/kb/dl923'
+
+  depends_on macos: '>= :snow_leopard'
+
+  pkg "QuickTimePlayer#{version}_SnowLeopard.pkg"
+
+  uninstall pkgutil: "com.apple.pkg.QuickTimePlayer#{version}_SnowLeopard"
+end