Add Drawlist

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

source/lithium/pools.cpp

@@ -6,11 +6,6 @@ namespace Li {
 PD::Pool<Vertex> pVtxPool;
 PD::Pool<u16> pIdxPool;
 
-PD_API void InitPools(size_t max_vertices) {
-  pVtxPool.Init(max_vertices);
-  pIdxPool.Init(max_vertices * 2);
-}
-
 PD_API Vertex* AllocateVertices(size_t count) {
   return pVtxPool.Allocate(count);
 }