Add build of MSI packages (#1148)

share/windows/wix-patch.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<CPackWiXPatch>
+  <CPackWiXFragment Id="CM_FP_KeePassXC.exe">
+    <Shortcut Id="CM_SP_KeePassXC.exe" Directory="ProgramMenuFolder"
+              Name="KeePassXC" Icon="ProductIcon.ico"
+              WorkingDirectory="INSTALL_ROOT" Advertise="yes" />
+  </CPackWiXFragment>
+</CPackWiXPatch>

share/windows/wix-template.xml

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?include "cpack_variables.wxi"?>
+
+<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"
+    RequiredVersion="3.6.3303.0">
+
+    <Product Id="$(var.CPACK_WIX_PRODUCT_GUID)"
+        Name="$(var.CPACK_PACKAGE_NAME)"
+        Language="1033"
+        Version="$(var.CPACK_PACKAGE_VERSION)"
+        Manufacturer="$(var.CPACK_PACKAGE_VENDOR)"
+        UpgradeCode="$(var.CPACK_WIX_UPGRADE_GUID)">
+
+        <Package InstallScope="perMachine" InstallerVersion="301" Compressed="yes"/>
+
+        <Media Id="1" Cabinet="media1.cab" EmbedCab="yes"/>
+
+        <MajorUpgrade
+            Schedule="afterInstallInitialize"
+            AllowSameVersionUpgrades="yes"
+            DowngradeErrorMessage="A later version of [ProductName] is already installed. Setup will now exit."/>
+
+        <WixVariable Id="WixUILicenseRtf" Value="$(var.CPACK_WIX_LICENSE_RTF)"/>
+        <Property Id="WIXUI_INSTALLDIR" Value="INSTALL_ROOT"/>
+
+        <?ifdef CPACK_WIX_PRODUCT_ICON?>
+        <Property Id="ARPPRODUCTICON">ProductIcon.ico</Property>
+        <Icon Id="ProductIcon.ico" SourceFile="$(var.CPACK_WIX_PRODUCT_ICON)"/>
+        <?endif?>
+
+        <?ifdef CPACK_WIX_UI_BANNER?>
+        <WixVariable Id="WixUIBannerBmp" Value="$(var.CPACK_WIX_UI_BANNER)"/>
+        <?endif?>
+
+        <?ifdef CPACK_WIX_UI_DIALOG?>
+        <WixVariable Id="WixUIDialogBmp" Value="$(var.CPACK_WIX_UI_DIALOG)"/>
+        <?endif?>
+
+        <FeatureRef Id="ProductFeature"/>
+
+        <UIRef Id="$(var.CPACK_WIX_UI_REF)" />
+
+        <?include "properties.wxi"?>
+        <?include "product_fragment.wxi"?>
+
+        <DirectoryRef Id="TARGETDIR">
+            <Directory Id="ProgramMenuFolder" />
+        </DirectoryRef>
+    </Product>
+</Wix>