Adds MsixAppInstallerData to tweak the install UI. (#68)

Fixes #63

Author: zooba

_msbuild.py

@@ -130,8 +130,12 @@ def mainw_exe(name):
 PACKAGE = Package('python-manager',
     PyprojectTomlFile('pyproject.toml'),
     # MSIX manifest
-    File('src/pymanager/appxmanifest.xml', name='appxmanifest.xml'),
-    File('src/pymanager/pymanager.appinstaller', name='pymanager.appinstaller'),
+    File('src/pymanager/appxmanifest.xml'),
+    File('src/pymanager/pymanager.appinstaller'),
+    Package(
+        'MSIX.AppInstaller.Data',
+        File('src/pymanager/MSIXAppInstallerData.xml'),
+    ),
 
     # Default settings
     File('src/pymanager.json'),

src/pymanager/MsixAppInstallerData.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AppInstallerUX xmlns="http://schemas.microsoft.com/msix/appinstallerux"
+                Version="1.0.0">
+    <!-- Using the blue and grey from python.org - dark mode users always get black -->
+    <UX AccentColor="#3776AB" BackgroundColor="#FCFCFC">
+        <Icon HorizontalAlignment="right" Logo="_resources\setupx150.png" Size="medium" />
+        <Buttons Text="Python" IsSecondaryButtonAccent="false"/>
+        <HyperLinks TopMargin="1">
+            <!-- Undocumented limit of two links - choose wisely! -->
+            <HyperLink Text="Python website"
+                       Url="https://www.python.org/"
+                       HorizontalAlignment="left" />
+            <HyperLink Text="Get help with this installer"
+                       Url="https://docs.python.org/dev/using/windows.html"
+                       HorizontalAlignment="left" />
+        </HyperLinks>
+    </UX>
+</AppInstallerUX>