(re)add marathon2 and marathon-infinity casks (#88604)

Both were removed in analytics purges, but they are being re added to match/parallel the marathon and aleph-one casks.

*marathon2: Removed in #63338 (cc482d5)
*marathon-infinity: Removed in #72428 (3d28779)

Casks/marathon-infinity.rb

@@ -0,0 +1,13 @@
+cask "marathon-infinity" do
+  version "20200830"
+  sha256 "b191070a8116b5081870c8673995589b450cc1183bbf88b1b865b5d251459f7a"
+
+  # github.com/Aleph-One-Marathon/alephone/ was verified as official when first introduced to the cask
+  url "https://github.com/Aleph-One-Marathon/alephone/releases/download/release-#{version}/MarathonInfinity-#{version}-Mac.dmg"
+  appcast "https://github.com/Aleph-One-Marathon/alephone/releases.atom"
+  name "Marathon Infinity"
+  desc "First-person shooter, third in a trilogy"
+  homepage "https://alephone.lhowon.org/"
+
+  app "Marathon Infinity.app"
+end

Casks/marathon2.rb

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+cask "marathon2" do
+  # note: "2" is not a version number, but an intrinsic part of the product name
+  version "20200830"
+  sha256 "a4c56cc2e837cec92bcded8406f5cb4cc7ddb7ce4472ac19e088120a47f18e50"
+
+  # github.com/Aleph-One-Marathon/alephone/ was verified as official when first introduced to the cask
+  url "https://github.com/Aleph-One-Marathon/alephone/releases/download/release-#{version}/Marathon2-#{version}-Mac.dmg"
+  appcast "https://github.com/Aleph-One-Marathon/alephone/releases.atom"
+  name "Marathon 2"
+  desc "First-person shooter, second in a trilogy"
+  homepage "https://alephone.lhowon.org/"
+
+  app "Marathon 2.app"
+end