feat(plot): nice-number ticks, axes, grid, traces, cursors, measurement queries

tests/CMakeLists.txt

@@ -32,6 +32,9 @@ add_executable(plot_tests
   test_ring_buffer.cpp
   test_minmax_pyramid.cpp
   test_series.cpp
+  test_ticks.cpp
+  test_measure.cpp
+  test_plot.cpp
   egl_headless.cpp
 )
 target_link_libraries(plot_tests PRIVATE plot::core ${plot_egl_library} Threads::Threads)