feat(input): host-agnostic events and pan/zoom/cursor controller

tests/CMakeLists.txt

@@ -35,6 +35,7 @@ add_executable(plot_tests
   test_ticks.cpp
   test_measure.cpp
   test_plot.cpp
+  test_controller.cpp
   egl_headless.cpp
 )
 target_link_libraries(plot_tests PRIVATE plot::core ${plot_egl_library} Threads::Threads)