Migrate to new plugin API.

CMakeLists.txt

@@ -1,15 +1,15 @@
 cmake_minimum_required(VERSION 3.21)
 project (Plugin.Core.SamplePlugin)
 
+# Top-level plugin build is not supported yet.
+# If the plugin is only built as subdirectory, this snippet is not needed and may be discarded.
 if (PROJECT_IS_TOP_LEVEL)
     set (CMAKE_CXX_STANDARD 17)
     set (REBELFORK_SDK "" CACHE STRING "Path to pre-built SDK")
     set (CMAKE_PREFIX_PATH ${REBELFORK_SDK}/share)
-    find_package(Urho3D REQUIRED)
+    find_package (Urho3D REQUIRED)
     include (${REBELFORK_SDK}/share/CMake/Modules/UrhoCommon.cmake)
 endif ()
 
 file (GLOB_RECURSE SOURCE_FILES *.h *.cpp)
-add_library(${PROJECT_NAME} ${SOURCE_FILES})
-define_static_plugin (${PROJECT_NAME} "${PROJECT_NAME}")
-target_link_libraries (${PROJECT_NAME} PRIVATE Urho3D)
+add_plugin (${PROJECT_NAME} "${SOURCE_FILES}")