Unify version specifying (#1439)

* installer: extract version number into separate file and use it where possible

* MSIX: rename package to include version on CDPx

* installer: generate assembly info for FZ editor

* MSIX: inject correct version to appxmanifest

installer/MSIX/update_appxmanifest_version.ps1

@@ -0,0 +1,5 @@
+$version = ([xml](Get-Content ..\Version.props)).Project.PropertyGroup.Version
+
+(Get-Content appxmanifest.xml) `
+  -replace '(Name="[\.\w]+"\sVersion=")([\d\.]+)"', -join('${1}', $version, '.0"') `
+  |  Out-File -Encoding utf8 appxmanifest.xml