Move the splat render

components/renderers/cpp/include/ftl/display.hpp

components/renderers/cpp/include/ftl/render/renderer.hpp

components/renderers/cpp/include/ftl/render/splat_render.hpp

components/renderers/cpp/include/ftl/rgbd_display.hpp

components/renderers/cpp/src/display.cpp

components/renderers/cpp/src/rgbd_display.cpp

components/renderers/cpp/src/splat_params.hpp

components/renderers/cpp/src/splat_render.cpp

components/renderers/cpp/src/splat_render_cuda.hpp