- add BLI_stack_count - add BLI_stack_pop_n to pop into an array - add BLI_stack_push_r, which returns a pointer that can be filled in Also remove sanity check in BLI_stack_pop, assert if the stack is empty.
- add BLI_stack_count - add BLI_stack_pop_n to pop into an array - add BLI_stack_push_r, which returns a pointer that can be filled in Also remove sanity check in BLI_stack_pop, assert if the stack is empty.