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/drawlist.cpp

@@ -1,3 +1,4 @@
+#include <algorithm>
 #include <iostream>
 #include <pd/drivers/gfx.hpp>
 #include <pd/lithium/drawlist.hpp>
@@ -19,19 +20,26 @@ PD_API void Drawlist::Copy(Drawlist& other) {
   pCommands.AppendCopy(other.pCommands);
 }
 
-PD_API void Drawlist::Optimize() {}
+PD_API void Drawlist::Optimize() {
+  if (pCommands.size() <= 1) return;
+  std::stable_sort(pCommands.begin(), pCommands.end(),
+                   [](const Command& a, const Command& b) {
+                     if (a.Layer != b.Layer) return a.Layer < b.Layer;
+                     if (a.SDF != b.SDF) return a.SDF < b.SDF;
+                     return a.Tex < b.Tex;
+                   });
+}
 
 PD_API void Drawlist::Clear() {
   UnbindTexture();
   pPath.ResetFast();
-  pVertices.ResetFast();
-  pIndices.ResetFast();
-  pCommands.ResetFast();
+  pCommands.NoReset();
 }
 
 /** Command Allocation */
 PD_API Command& Drawlist::NewCommand() {
   auto cmd = pCommands.Allocate(1);
+  cmd->Reset();
   cmd->Tex = pCurrentTexture.GetID();
   return *cmd;
 }