Add Drawlist

- Add Pool iterator support
- Add Pool Expandability
- Add Pool::Push
- Add Lithium Maths API
- Remove InitPools
- update spirv-helper

include/pd/lithium/pools.hpp

@@ -5,8 +5,8 @@
 
 namespace PD {
 namespace Li {
-PD_API void InitPools(size_t max_vertices = 32768);
 PD_API Vertex* AllocateVertices(size_t count);
 PD_API u16* AllocateIndices(size_t count);
+PD_API void ResetPools();
 }  // namespace Li
 }  // namespace PD