Upgrade all manifests to v1 manifest format

manifests/g/GitHub/Atom/1.49.0/GitHub.Atom.yaml

@@ -0,0 +1,33 @@
+PackageIdentifier: GitHub.Atom
+Publisher: GitHub
+PackageName: Atom
+Author: GitHub
+ShortDescription: A hackable text editor for the 21st Century, free and open source.
+Moniker: atom
+Tags:
+- Text Editor
+- IDE
+- Development
+FileExtensions:
+- txt
+- cfg
+- ini
+- yaml
+PackageUrl: https://atom.io
+License: MIT License
+LicenseUrl: https://github.com/atom/atom/blob/master/LICENSE.md
+MinimumOSVersion: 10.0.0.0
+PackageVersion: 1.49.0
+InstallerSwitches:
+  Custom: /norestart
+  Silent: /silent
+  SilentWithProgress: /silent
+InstallerType: exe
+Installers:
+- Architecture: x64
+  InstallerUrl: https://github.com/atom/atom/releases/download/v1.49.0/AtomSetup-x64.exe
+  InstallerSha256: 8a240a17642875c0aeb925cae81d5800fe58452022945423cfa44b3378912d8c
+  Scope: user
+PackageLocale: en-US
+ManifestType: singleton
+ManifestVersion: 1.0.0