Bring back global lithium pools

why?
cause sorting around the global driver pool would basically use more cpu power then just copy data sequences into the right order
And sorting data references costs 0 performance at all

source/lithium/pools.cpp

@@ -0,0 +1,16 @@
+#include <pd/lithium/pools.hpp>
+
+namespace PD {
+namespace Li {
+static PD::Pool<Vertex> gVertexPool;
+static PD::Pool<u16> gIndexPool;
+
+PD_API PD::Pool<Vertex>& GetVertexPool() { return gVertexPool; }
+PD_API PD::Pool<u16>& GetIndexPool() { return gIndexPool; }
+
+PD_API void ResetPools() {
+  gVertexPool.NoReset();
+  gIndexPool.NoReset();
+}
+}  // namespace Li
+}  // namespace PD