ENH: Use imgui for status and input

ext/imgui.cmake

@@ -0,0 +1,31 @@
+include(FetchContent)
+
+FetchContent_Declare(
+    imgui
+    GIT_REPOSITORY https://github.com/ocornut/imgui
+    GIT_TAG v1.86
+    GIT_PROGRESS TRUE
+)
+
+FetchContent_GetProperties(imgui)
+if (NOT ${imgui}_POPULATED)
+    FetchContent_MakeAvailable(imgui)
+
+    add_library(
+        imgui
+        ${imgui_SOURCE_DIR}/backends/imgui_impl_glfw.cpp
+        ${imgui_SOURCE_DIR}/backends/imgui_impl_glfw.h
+        ${imgui_SOURCE_DIR}/backends/imgui_impl_opengl3.cpp
+        ${imgui_SOURCE_DIR}/backends/imgui_impl_opengl3.h
+        ${imgui_SOURCE_DIR}/imgui.cpp
+        ${imgui_SOURCE_DIR}/imgui.h
+        ${imgui_SOURCE_DIR}/imgui_demo.cpp
+        ${imgui_SOURCE_DIR}/imgui_draw.cpp
+        ${imgui_SOURCE_DIR}/imgui_tables.cpp
+        ${imgui_SOURCE_DIR}/imgui_widgets.cpp
+    )
+
+    target_include_directories(imgui PUBLIC ${imgui_SOURCE_DIR})
+    target_link_libraries(imgui PRIVATE glfw)
+endif ()
+