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

CMakeLists.txt

@@ -19,6 +19,11 @@ add_library(plot_core
   src/render/buffer.cpp
   src/render/vertex_array.cpp
   src/render/program.cpp
+  src/plot/ticks.cpp
+  src/plot/axis.cpp
+  src/plot/grid.cpp
+  src/plot/measure.cpp
+  src/plot/plot.cpp
 )
 add_library(plot::core ALIAS plot_core)