[appstore] revert to using a script to build AppStore bundle

* Having two separate Visual Studio solution files, while more convenient, was a major
  pain in the ass and it also required us to update versioning in the .appxmanifest for
  each commit.
* Also, this new AppStore build process enables us to use the GitHub Actions executables
  to further foster the complete transparency of our build process.

_chver.sh

@@ -33,7 +33,5 @@ _EOF
 # First run sed to substitute our variable in the sed command file
 sed -i -e "s/@@MAJOR@@/$MAJOR/g" -e "s/@@MINOR@@/$MINOR/g" cmd.sed
 sed -b -i -f cmd.sed src/rufus.rc
-sed -b -i -f cmd.sed res/appstore/Package.appxmanifest
-sed -b -i -f cmd.sed res/appstore/packme.cmd
 rm cmd.sed
 source ./bootstrap.sh

_pre-commit.sh

@@ -38,9 +38,7 @@ _EOF
 sed -i -e "s/@@BUILD@@/$BUILD/g" cmd.sed
 # Run sed to update the nano version
 sed -b -i -f cmd.sed src/rufus.rc
-sed -b -i -f cmd.sed res/appstore/Package.appxmanifest
 # NB: we need to run git add else the modified files may be ignored
 git add src/rufus.rc
-git add res/appstore/Package.appxmanifest
 
 rm cmd.sed

res/appstore/RufusAppxManifest.xml

@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="utf-8" standalone="yes"?>
+<Package
+ IgnorableNamespaces="uap uap7 uap8 rescap build"
+ xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
+ xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
+ xmlns:uap7="http://schemas.microsoft.com/appx/manifest/uap/windows10/7"
+ xmlns:uap8="http://schemas.microsoft.com/appx/manifest/uap/windows10/8"
+ xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
+ xmlns:build="http://schemas.microsoft.com/developer/appx/2015/build">
+  <Identity
+   Name="19453.net.Rufus"
+   Publisher="CN=7AC86D13-3E5A-491A-ADD5-80095C212740"
+   Version="@VERSION@"
+   ProcessorArchitecture="@ARCH@"/>
+  <Properties>
+    <DisplayName>Rufus</DisplayName>
+    <PublisherDisplayName>Akeo Consulting</PublisherDisplayName>
+    <Logo>Images\StoreLogo.png</Logo>
+  </Properties>
+  <Dependencies>
+    <TargetDeviceFamily 
+     Name="Windows.Desktop"
+     MinVersion="10.0.14316.0"
+     MaxVersionTested="10.0.22000.194"/>
+    <PackageDependency
+     Name="Microsoft.VCLibs.140.00.UWPDesktop"
+     MinVersion="14.0.30035.0"
+     Publisher="CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US"/>
+  </Dependencies>
+  <Resources>
+    <Resource Language="en-US"/>
+    <Resource uap:Scale="200"/>
+  </Resources>
+  <Applications>
+    <Application
+     Id="Rufus"
+     Executable="rufus\rufus.exe"
+     EntryPoint="Windows.FullTrustApplication">
+      <uap:VisualElements
+       DisplayName="Rufus"
+       Description="Rufus"
+       BackgroundColor="transparent"
+       Square150x150Logo="Images\Square150x150Logo.png"
+       Square44x44Logo="Images\Square44x44Logo.png">
+        <uap:DefaultTile
+         Wide310x150Logo="Images\Wide310x150Logo.png"
+         Square71x71Logo="Images\SmallTile.png"
+         Square310x310Logo="Images\LargeTile.png">
+          <uap:ShowNameOnTiles>
+            <uap:ShowOn Tile="square150x150Logo"/>
+            <uap:ShowOn Tile="wide310x150Logo"/>
+            <uap:ShowOn Tile="square310x310Logo"/>
+          </uap:ShowNameOnTiles>
+        </uap:DefaultTile>
+      </uap:VisualElements>
+      <uap7:Properties>
+        <uap8:ActiveCodePage>UTF-8</uap8:ActiveCodePage>
+      </uap7:Properties>
+    </Application>
+  </Applications>
+  <Capabilities>
+    <rescap:Capability Name="runFullTrust"/>
+    <rescap:Capability Name="allowElevation"/>
+  </Capabilities>
+</Package>

res/appstore/ScaleAppxManifest.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<Package
+ xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
+ xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
+ IgnorableNamespaces="uap">
+  <Identity
+   Name="19453.net.Rufus"
+   Publisher="CN=7AC86D13-3E5A-491A-ADD5-80095C212740"
+   Version="@VERSION@"
+   ResourceId="split.scale-@SCALE@"/>
+  <Properties>
+    <ResourcePackage>true</ResourcePackage>
+    <DisplayName>Rufus</DisplayName>
+    <PublisherDisplayName>Akeo Consulting</PublisherDisplayName>
+    <Logo>Images\StoreLogo.png</Logo>
+  </Properties>
+  <Resources>
+    <Resource uap:Scale="@SCALE@"/>
+  </Resources>
+  <Dependencies>
+    <TargetDeviceFamily
+     Name="Windows.Desktop" 
+     MinVersion="10.0.14316.0"
+     MaxVersionTested="10.0.22000.194"/>
+  </Dependencies>
+</Package>