feat(data): SPSC ring buffer, incremental min/max LOD pyramid, series types

CMakeLists.txt

@@ -7,6 +7,10 @@ include(plot_options)
 add_library(plot_core
   src/core/status.cpp
   src/math/transform.cpp
+  src/data/minmax_pyramid.cpp
+  src/data/series.cpp
+  src/data/array_series.cpp
+  src/data/stream_series.cpp
   src/gl/loader.cpp
   src/gl/handle.cpp
 )