Upgrade all manifests to v1 manifest format

manifests/s/Sigil-Ebook/Sigil/1.4.3/Sigil-Ebook.Sigil.yaml

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+PackageIdentifier: Sigil-Ebook.Sigil
+PackageVersion: 1.4.3
+PackageName: Sigil
+Publisher: Sigil-Ebook
+License: GPL3
+LicenseUrl: https://github.com/Sigil-Ebook/Sigil/blob/master/COPYING.txt
+Moniker: sigil
+Tags:
+- ebook
+- sigil
+- ebook editor
+- epub
+ShortDescription: Sigil is a free, open source, multi-platform ebook editor that uses Qt (and QtWebEngine). It is designed to edit books in ePub format (both ePub 2 and ePub 3).
+PackageUrl: https://sigil-ebook.com/
+Installers:
+- Architecture: x64
+  InstallerUrl: https://github.com/Sigil-Ebook/Sigil/releases/download/1.4.3/Sigil-1.4.3-Windows-x64-Setup.exe
+  InstallerSha256: e36c4624e16e450a85fc524f672c772094e15e51db706a7ee4a68fad27f288f9
+  InstallerType: inno
+  InstallerSwitches:
+    Silent: /ALLUSERS /NORESTART /TYPE=FULL /VERYSILENT
+    SilentWithProgress: /ALLUSERS /NORESTART /TYPE=FULL /SILENT
+PackageLocale: en-US
+ManifestType: singleton
+ManifestVersion: 1.0.0