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/CMakeLists.txt

@@ -1,7 +1,10 @@
 set(RENDERLIBNAME pixelariumrenderlib)
 
 set(RENDERLIBSRC
-  CvMatRender.cpp)
+  CvMatRender.cpp
+  RenderImageManager.cpp
+  PixelariumImageView.cpp
+  ImageViewFactory.cpp)
 
 add_library(${RENDERLIBNAME} STATIC
   ${RENDERLIBSRC})
@@ -10,4 +13,5 @@ target_link_libraries(${RENDERLIBNAME}
   PRIVATE pixelariumimagelib)
 
 target_include_directories(${RENDERLIBNAME}
-  PRIVATE ${CMAKE_SOURCE_DIR}/lib)
+  PRIVATE ${CMAKE_SOURCE_DIR}/lib
+  PRIVATE ${imgui_DIR})