Upgrade all manifests to v1 manifest format

manifests/d/Dropbox/Dropbox/99.3.496/Dropbox.Dropbox.yaml

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+PackageIdentifier: Dropbox.Dropbox
+PackageName: Dropbox
+Moniker: Dropbox
+PackageVersion: 99.3.496
+Publisher: Dropbox
+Author: Dropbox
+License: MIT License
+LicenseUrl: https://www.dropbox.com/terms
+MinimumOSVersion: 10.0.0.0
+PackageUrl: https://www.dropbox.com
+ShortDescription: Organize all your team’s content, tune out distractions, and get everyone coordinated with the world’s first smart workspace.
+Tags:
+- cloud
+- online
+- storage
+- dropbox
+- pictures
+- files
+InstallerType: exe
+Installers:
+- Architecture: x64
+  InstallerUrl: https://clientupdates.dropboxstatic.com/dbx-releng/client/Dropbox%2099.3.496%20Offline%20Installer.exe
+  InstallerSha256: 1c2fcc756be81e243954574e7522fd1e51d432a403c27c36b95eaf962880a6fa
+  InstallerSwitches:
+    Silent: /s
+    SilentWithProgress: /s
+PackageLocale: en-US
+ManifestType: singleton
+ManifestVersion: 1.0.0