[windows] Update WebView2 to 1.0.864.35

v2/internal/ffenestri/windows/README.md

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-These files were generated using the scripts in the [webview](https://github.com/webview/webview) project and compressed using UPX.

v2/internal/ffenestri/windows/scripts/README.md

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+# Build
+
+This script will download the given webview2 sdk version and copy out the files necessary for building Wails apps.
+
+## Prerequistes
+
+  - nuget
+
+## Usage
+
+`updatesdk.bat <version>`

v2/internal/ffenestri/windows/scripts/updatesdk.bat

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+@echo off
+IF %1.==. GOTO NoVersion
+nuget install microsoft.web.webview2 -Version %1 -OutputDirectory . >NUL || goto :eof
+echo Downloaded microsoft.web.webview2.%1
+
+set sdk_version=%1
+set native_dir="%~dp0\microsoft.web.webview2.%sdk_version%\build\native"
+copy "%native_dir%\include\*.h" .. >NUL
+copy "%native_dir%\x64\WebView2Loader.dll" "..\x64" >NUL
+@rd /S /Q "microsoft.web.webview2.%sdk_version%"
+del /s version.txt  >nul 2>&1
+echo The version of WebView2 used: %sdk_version% > version.txt
+echo SDK updated to %sdk_version%
+goto :eof
+
+:NoVersion
+  echo Please provide a version number, EG: 1.0.664.37
+  goto :eof