Add stackAllocReset method

engine/breeze/memory/stack_alloc.c

@@ -20,6 +20,10 @@ void bzStackAllocDestroy(BzStackAlloc *alloc) {
     alloc->allocated = 0;
 }
 
+void bzStackAllocReset(BzStackAlloc *alloc) {
+    alloc->allocated = 0;
+}
+
 void *bzStackAlloc(BzStackAlloc *alloc, size_t numBytes) {
     BZ_ASSERT(alloc->allocated + numBytes < alloc->size);
     void *allocated = (u8 *) alloc->memory + alloc->allocated;

engine/breeze/memory/stack_alloc.h

@@ -12,6 +12,8 @@ typedef struct BzStackAlloc {
 BzStackAlloc bzStackAllocCreate(size_t size);
 void         bzStackAllocDestroy(BzStackAlloc *alloc);
 
+void bzStackAllocReset(BzStackAlloc *alloc);
+
 void *bzStackAlloc(BzStackAlloc *alloc, size_t numBytes);
 void  bzStackAllocFree(BzStackAlloc *alloc, void *ptr);