Upgrade all manifests to v1 manifest format

manifests/p/plex/Plex/1.14.0.1340/Plex.Plex.yaml

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+PackageIdentifier: Plex.Plex
+Publisher: Plex
+PackageName: Plex for Windows
+Author: Plex
+ShortDescription: This is the new desktop client that replaces plexmediaplayer. It supports downloads and implements the UNO interface.
+Moniker: plex
+Tags:
+- streaming
+- video
+- music
+PackageUrl: https://www.plex.tv/media-server-downloads/#plex-app
+License: Copyright © 2020, Plex
+LicenseUrl: https://www.plex.tv/about/privacy-legal/plex-terms-of-service/
+MinimumOSVersion: 10.0.0.0
+PackageVersion: 1.14.0.1340
+InstallerType: nullsoft
+Installers:
+- Architecture: neutral
+  InstallerUrl: https://downloads.plex.tv/plex-desktop/1.14.0.1340-0acc754c/windows/Plex-1.14.0.1340-0acc754c-x86_64.exe
+  InstallerSha256: 42c4f19458438bf62ef9343d2fdb1f3dbc401dd9f572e749ceae5e1d4fc794e4
+  Scope: machine
+PackageLocale: en-US
+ManifestType: singleton
+ManifestVersion: 1.0.0

manifests/p/plex/Plex/1.15.1.1358/Plex.Plex.yaml

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+PackageIdentifier: Plex.Plex
+Publisher: Plex
+PackageName: Plex for Windows
+Author: Plex
+ShortDescription: This is the new desktop client that replaces plexmediaplayer. It supports downloads and implements the UNO interface.
+Moniker: plex
+Tags:
+- streaming
+- video
+- music
+PackageUrl: https://www.plex.tv/media-server-downloads/#plex-app
+License: Copyright © 2020, Plex
+LicenseUrl: https://www.plex.tv/about/privacy-legal/plex-terms-of-service/
+MinimumOSVersion: 10.0.0.0
+PackageVersion: 1.15.1.1358
+InstallerType: nullsoft
+Installers:
+- Architecture: neutral
+  InstallerUrl: https://downloads.plex.tv/plex-desktop/1.15.1.1358-43550df5/windows/Plex-1.15.1.1358-43550df5-x86_64.exe
+  InstallerSha256: d67eb6dc832c1286c6ddc492e2ae452371bb7ae384cfd50605f1bfbf266b9ccb
+PackageLocale: en-US
+ManifestType: singleton
+ManifestVersion: 1.0.0