Misc (#19)

* get image returns optional<Mat> instead of unique_ptr<Mat>

* introduce complexity

* rename image load function

* add example for a basic reader for binary image files

* fix windows build?

* add a status bar underneath the menu bar

* use status bar in custom_0 example app

* clang formats

* packing w/ pragma push

* add "Save As" functions to image views

* resize over reserve

* rm local override uri

* add simple thread pool

* rename to simple_thread_pool

* get rid of useless renderlib

* document version inc

* extract hardcoded values to in-header

* clang format patch

* clone registered image in custom_0

* document binary-file header

* minor fixes

* clang format

* rm unused render cmake

lib/app/DefaultApp.hpp

@@ -19,7 +19,7 @@ class DefaultApp : public AppGLFW
     DefaultApp(const utils::log::ILog& log, pixelarium::resources::ImageResourcePool& pool)
         : application::AppGLFW(log), pool_(pool), gallery_(log, pool)
     {
-        gallery_.SetLoadFunction([&]() -> void { this->LoadImage(); });
+        gallery_.SetLoadFunction([&]() -> void { this->LoadImageDialogue(); });
     }
 
    protected:
@@ -32,7 +32,7 @@ class DefaultApp : public AppGLFW
     application::PixelariumImageGallery gallery_;
 
    protected:
-    void LoadImage();
+    void LoadImageDialogue();
 
    private:
     bool image_listp_{true};