Add manifest file for Mozilla Thunderbird (English U.S.) v78.1.1 x64 (#2950)

manifests/Mozilla/Thunderbird/Thunderbird_v78.1.1/78.1.1.yaml

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+# ================== General ==================
+
+Id: Mozilla.Thunderbird.Thunderbird_v78.1.1
+Version: 78.1.1
+Name: Thunderbird (English US)
+Publisher: Mozilla
+AppMoniker: thunderbird
+Tags: thunderbird, email, eMail, E-mail, email Client
+Description: Thunderbird is a free email application that’s easy to set up and customize!
+
+# ================== License ==================
+
+Homepage: https://www.thunderbird.net
+License: Mozilla Public License Version 2.0
+LicenseUrl: https://www.mozilla.org/en-US/MPL/2.0/
+
+# ================= Installer =================
+
+Installers:
+  - Arch: x64
+    Url: https://download-installer.cdn.mozilla.net/pub/thunderbird/releases/78.1.1/win64/en-US/Thunderbird%20Setup%2078.1.1.msi
+    Sha256: 13CEE5D3523E1103D7821DFBD6ED8509A18C21D8369F980E844F9EEC5995A65F
+    InstallerType: msi
+    Switches:
+          Custom: /norestart
+          Silent: /qn
+          SilentWithProgress: /qb