[misc] add build data for Windows Apps Store

* Rather useless, since elevated apps are neither accepted by Microsoft nor
  will they run by default when sideloaded. But, hey, I can has apps!
* Also update sign and sed scripts

res/appstore/AppxManifest.xml

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="utf-8" standalone="yes"?>
+<Package
+ xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
+ xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
+ xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities">
+  <!-- NB: If you're signing with Authenticode, then the Publisher *MUST* match the LDAP fields from the
+       signature certificate exactly, else SignTool will fail with error 0x8007000b. Note that this makes
+       for an interesting struggle, when you also happen to have a comma in one of the fields... -->
+  <Identity
+   Name="Rufus"
+   Version="2.15.1091.0"
+   ProcessorArchitecture="x86"
+   Publisher='CN=Akeo Consulting, O=Akeo Consulting, STREET="24, Grey Rock", L=Milford, S=Co Donegal, PostalCode=Co Donegal, C=IE' />
+    <Properties>
+      <DisplayName>Rufus</DisplayName>
+      <PublisherDisplayName>Akeo Consulting</PublisherDisplayName>
+      <Description>Rufus</Description>
+      <Logo>Assets\Rufus-48.png</Logo>
+    </Properties>
+  <Resources>
+    <Resource Language="en-US" />
+  </Resources>
+  <Dependencies>
+    <TargetDeviceFamily
+     Name="Windows.Desktop"
+     MinVersion="10.0.14316.0"
+     MaxVersionTested="10.0.15063.0" />
+  </Dependencies>
+  <Capabilities>
+    <rescap:Capability Name="runFullTrust"/>
+  </Capabilities>
+  <Applications>
+    <Application
+     Id="Rufus"
+     Executable="rufus.exe"
+     EntryPoint="Windows.FullTrustApplication">
+      <uap:VisualElements
+       BackgroundColor="transparent"
+       DisplayName="Rufus"
+       Square150x150Logo="Assets\Rufus-150.png"
+       Square44x44Logo="Assets\Rufus-44.png"
+       Description="Rufus">
+        <uap:DefaultTile>
+          <uap:ShowNameOnTiles>
+            <uap:ShowOn Tile="square150x150Logo" />
+          </uap:ShowNameOnTiles>
+        </uap:DefaultTile>
+      </uap:VisualElements>
+    </Application>
+  </Applications>
+</Package>

res/appstore/README.txt

@@ -0,0 +1,9 @@
+This directory contains the resources to create a Windows Store package.
+
+However, since Microsoft doesn't allow elevated applications into the Windows
+Store, and, even if you install it manually, Windows 10 will also refuse to
+elevate it (so you have to explicitly select to run it as admin *every time*),
+this is rather pointless.
+
+Still, you can find the latest signed application package at:
+https://rufus.akeo.ie/testing/

res/appstore/packme.cmd

@@ -0,0 +1,15 @@
+@echo off
+set VERSION=2.15
+echo [Files]>mappings.lst
+echo "..\icon-set\rufus-44.png"     "Assets\Rufus-44.png">>mappings.lst
+echo "..\icon-set\rufus-48.png"     "Assets\Rufus-48.png">>mappings.lst
+echo "..\icon-set\rufus-150.png"    "Assets\Rufus-150.png">>mappings.lst
+echo "..\..\rufus-%VERSION%.exe"    "rufus.exe">>mappings.lst
+echo "AppxManifest.xml"             "AppxManifest.xml">>mappings.lst
+"C:\Program Files (x86)\Windows Kits\10\bin\x64\MakeAppx" pack /o /f mappings.lst /p Rufus-%VERSION%.appx
+if ERRORLEVEL 1 goto out
+"C:\Program Files (x86)\Windows Kits\10\bin\x64\SignTool" sign /v /sha1 5759b23dc8f45e9120a7317f306e5b6890b612f0 /fd SHA256 /tr http://timestamp.comodoca.com/rfc3161 /td SHA256 Rufus-%VERSION%.appx
+:out
+del mappings.lst
+pause
+exit