Proper image rendering ux (#5)

* can draw from selection

* add light-weight render manager to render many images simultaneously

* [debug me] currently the image close button does not do

* the unselected image can be closed now

* can close images and manually open them on demand

* cosmetic

* image view stuff in render subdirectory

* cosmetic

* generate docs

* review

windows support

some cosmetics

💅 and pin libCZI module

lib/rendering/ImageViewFactory.cpp

@@ -0,0 +1,22 @@
+#include "ImageViewFactory.hpp"
+
+#include <memory>
+#include <optional>
+
+/// @brief Creates a PixelariumImageView from a resource image.
+/// @param image_id The ID of the image resource to render.
+/// @return A unique pointer to the PixelariumImageView, or nullptr if the image resource is not found or is empty.  The image data is copied.
+std::unique_ptr<pixelarium::render::PixelariumImageView> pixelarium::render::ImageViewFactory::RenderImage(
+    size_t image_id)
+{
+    auto img{this->image_pool_.GetResource(image_id)};
+
+    if (!img.has_value() || img.value()->Empty())
+    {
+        return nullptr;
+    }
+
+    // beware: here we copy the actual image resource over to the new image
+    return std::make_unique<PixelariumImageView>(std::make_shared<Image>(*img.value()));
+}
+