Upgrade all manifests to v1 manifest format

manifests/p/plex/Plexamp/3.3.1/Plex.Plexamp.yaml

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+PackageIdentifier: Plex.Plexamp
+Publisher: Plex
+PackageName: Plexamp
+Author: Plex
+ShortDescription: A beautiful Plex music player for audiophiles, curators, and hipsters.
+Moniker: plexamp
+Tags:
+- multimedia
+- mp3
+- audio
+- player
+PackageUrl: https://plexamp.com/
+License: Copyright © 2020, Plex
+LicenseUrl: https://www.plex.tv/about/privacy-legal/plex-terms-of-service/
+MinimumOSVersion: 10.0.0.0
+PackageVersion: 3.3.1
+InstallerSwitches:
+  Custom: ''
+  Silent: /S
+  SilentWithProgress: /S
+InstallerType: exe
+Installers:
+- Architecture: x64
+  InstallerUrl: https://plexamp.plex.tv/plexamp.plex.tv/desktop/Plexamp%20Setup%203.3.1.exe
+  InstallerSha256: 2e9f31d9b06ed5a48d79fc10feb87d576ee4a9ea05c1651b25cf7f13b8898db2
+  Scope: user
+PackageLocale: en-US
+ManifestType: singleton
+ManifestVersion: 1.0.0