chore: update ImGui configuration and remove legacy CMake file

- Incremented cache revision in dependencies.lock to trigger rebuild.
- Deleted obsolete imgui.cmake file to streamline project structure.
- Updated imgui.cmake to set C++ standard requirement for ImGui and its test engine.

Benefits:
- Simplifies dependency management and ensures compatibility with C++17.
- Cleans up unused files, improving project maintainability.

cmake/dependencies.lock

@@ -21,6 +21,7 @@ set(FTXUI_VERSION "5.0.0" CACHE STRING "FTXUI version")
 
 # ImGui
 set(IMGUI_VERSION "1.90.4" CACHE STRING "Dear ImGui version")
+# Cache revision: increment to force rebuild (current: 2)
 
 # ASAR
 set(ASAR_VERSION "main" CACHE STRING "ASAR version")

cmake/dependencies/imgui.cmake

@@ -25,6 +25,9 @@ target_include_directories(ImGui PUBLIC
   ${IMGUI_DIR}/backends
 )
 
+# Set C++ standard requirement (ImGui 1.90+ requires C++11, we use C++17 for consistency)
+target_compile_features(ImGui PUBLIC cxx_std_17)
+
 # Link to SDL2
 target_link_libraries(ImGui PUBLIC ${YAZE_SDL2_TARGETS})
 
@@ -52,6 +55,7 @@ if(YAZE_BUILD_TESTS)
       ${IMGUI_TEST_ENGINE_DIR}
       ${CMAKE_SOURCE_DIR}/src/lib
     )
+    target_compile_features(ImGuiTestEngine PUBLIC cxx_std_17)
     target_link_libraries(ImGuiTestEngine PUBLIC ImGui ${YAZE_SDL2_TARGETS})
     target_compile_definitions(ImGuiTestEngine PUBLIC
       IMGUI_ENABLE_TEST_ENGINE=1

cmake/imgui.cmake

@@ -1,42 +0,0 @@
-# gui libraries ---------------------------------------------------------------
-set(IMGUI_PATH  ${CMAKE_SOURCE_DIR}/src/lib/imgui)
-file(GLOB IMGUI_SOURCES ${IMGUI_PATH}/*.cpp)
-set(IMGUI_BACKEND_SOURCES
-  ${IMGUI_PATH}/backends/imgui_impl_sdl2.cpp
-  ${IMGUI_PATH}/backends/imgui_impl_sdlrenderer2.cpp
-  ${IMGUI_PATH}/misc/cpp/imgui_stdlib.cpp
-)
-add_library("ImGui" STATIC ${IMGUI_SOURCES} ${IMGUI_BACKEND_SOURCES})
-target_include_directories("ImGui" PUBLIC ${IMGUI_PATH} ${IMGUI_PATH}/backends)
-target_include_directories(ImGui PUBLIC ${SDL2_INCLUDE_DIR})
-target_compile_definitions(ImGui PUBLIC
-  IMGUI_IMPL_OPENGL_LOADER_CUSTOM=<SDL2/SDL_opengl.h>  GL_GLEXT_PROTOTYPES=1)
-
-# ImGui Test Engine - Always built when tests are enabled for simplified integration
-# The test infrastructure is tightly coupled with the editor, so we always include it
-if(YAZE_BUILD_TESTS)
-  set(IMGUI_TEST_ENGINE_PATH ${CMAKE_SOURCE_DIR}/src/lib/imgui_test_engine/imgui_test_engine)
-  file(GLOB IMGUI_TEST_ENGINE_SOURCES ${IMGUI_TEST_ENGINE_PATH}/*.cpp)
-  add_library("ImGuiTestEngine" STATIC ${IMGUI_TEST_ENGINE_SOURCES})
-  target_include_directories(ImGuiTestEngine PUBLIC ${IMGUI_PATH} ${CMAKE_SOURCE_DIR}/src/lib)
-  target_link_libraries(ImGuiTestEngine PUBLIC ImGui)
-  target_compile_definitions(ImGuiTestEngine PUBLIC 
-    IMGUI_ENABLE_TEST_ENGINE=1 
-    IMGUI_TEST_ENGINE_ENABLE_COROUTINE_STDTHREAD_IMPL=1)
-  
-  message(STATUS "✓ ImGui Test Engine enabled (tests are ON)")
-else()
-  message(STATUS "✗ ImGui Test Engine disabled (tests are OFF)")
-endif()
-
-set(
-  IMGUI_SRC
-  ${IMGUI_PATH}/imgui.cpp
-  ${IMGUI_PATH}/imgui_demo.cpp
-  ${IMGUI_PATH}/imgui_draw.cpp
-  ${IMGUI_PATH}/imgui_widgets.cpp
-  ${IMGUI_PATH}/backends/imgui_impl_sdl2.cpp
-  ${IMGUI_PATH}/backends/imgui_impl_sdlrenderer2.cpp
-  ${IMGUI_PATH}/misc/cpp/imgui_stdlib.cpp
-)
-