[Setup] Use WiX bootstrapper instead of a custom one (#15050)

@dhowett gave approval on teams.  Squash merging

installer/PowerToysSetupCustomActions/RcResource.h

@@ -0,0 +1,63 @@
+#pragma once
+
+#include <string_view>
+#include <optional>
+#include <filesystem>
+#include <fstream>
+
+#include <Windows.h>
+
+class RcResource
+{
+public:
+    const std::byte* _memory = nullptr;
+    size_t _size = 0;
+
+    static inline std::optional<RcResource> create(int resource_id, const std::wstring_view resource_class, const HINSTANCE handle = nullptr)
+    {
+        const HRSRC resHandle = FindResourceW(handle, MAKEINTRESOURCEW(resource_id), resource_class.data());
+        if (!resHandle)
+        {
+            return std::nullopt;
+        }
+
+        const HGLOBAL memHandle = LoadResource(handle, resHandle);
+        if (!memHandle)
+        {
+            return std::nullopt;
+        }
+
+        const size_t resSize = SizeofResource(handle, resHandle);
+        if (!resSize)
+        {
+            return std::nullopt;
+        }
+
+        auto res = static_cast<const std::byte*>(LockResource(memHandle));
+        if (!res)
+        {
+            return std::nullopt;
+        }
+
+        return RcResource{ res, resSize };
+    }
+
+    inline bool saveAsFile(const std::filesystem::path destination)
+    {
+        std::fstream installerFile{ destination, std::ios_base::binary | std::ios_base::out | std::ios_base::trunc };
+        if (!installerFile.is_open())
+        {
+            return false;
+        }
+
+        installerFile.write(reinterpret_cast<const char*>(_memory), _size);
+        return true;
+    }
+
+private:
+    RcResource() = delete;
+    RcResource(const std::byte* memory, size_t size) :
+        _memory{ memory }, _size{ size }
+    {
+    }
+};