Add initial imgui implementation

hecl/lib/CMakeLists.txt

@@ -40,6 +40,7 @@ set(HECL_HEADERS
     ../include/hecl/MathExtras.hpp
     ../include/hecl/UniformBufferPool.hpp
     ../include/hecl/VertexBufferPool.hpp
+    ../include/hecl/IndexBufferPool.hpp
     ../include/hecl/PipelineBase.hpp
     ../include/hecl/Pipeline.hpp
     ../include/hecl/Compilers.hpp)

hecl/lib/Pipeline.cpp

@@ -164,4 +164,4 @@ SPECIALIZE_STAGE_CONVERTER(PlatformType::NX)
 
 #endif
 
-} // namespace hecl
+} // namespace hecl