* [imgui] Add support for displaying images correctly that are rotated in texture atlas
[imgui] Add parameter to select if displayed image maintains aspect ratio
[imgui] Move static methods to anonymous namespace
[imgui] Minor code clean-up
* [imgui] Add support for displaying SpriteFrame
* [imgui] Update test to show usage of ImGuiPresenter::image helper methods
* [Inspector] Show image of selected sprite