Enhance image type support (#18)

* adds tiff support

* doc update

* adds memory-based =IPixelariumImage= implementation

* add usage example for custom user control

* enhance

* clang-format

fix readme

fix docs

lib/imaging/impl/PixelariumTiff.cpp

@@ -0,0 +1,34 @@
+#include "PixelariumTiff.hpp"
+
+#include <filesystem>
+#include <memory>
+#include <opencv2/imgcodecs.hpp>
+#include <string>
+
+pixelarium::imaging::PixelariumTiff::PixelariumTiff(const std::string& uri, const Log& log) : log_(log)
+{
+    if (!std::filesystem::exists(uri))
+    {
+        throw std::runtime_error("Render file not found.");
+    }
+
+    this->is_empty_ = false;
+    this->uri_ = std::filesystem::path(uri);
+}
+
+std::unique_ptr<cv::Mat> pixelarium::imaging::PixelariumTiff::TryGetImage()
+{
+    try
+    {
+        auto img = std::make_unique<cv::Mat>(cv::imread(this->uri_.string()));
+
+        this->is_empty_ = false;
+
+        return img;
+    }
+    catch (const std::exception& e)
+    {
+        this->is_empty_ = true;
+        return {};
+    }
+}