add new interface function for FPGA track close #1479

fix the dealign bug in fetch op FPGA track fixed#1521

fix memory leakage problem close #1523

fix a bug in sigmoid kernel in FPGA track fixed#1518

Not use MemoryOptPass() for FPGA track  close #1516

Add memory optimize pass, which will make all variables reuse memory as much as possible

fix proposal-NMS no use bug for FPGA track #1512

add slidingwindow#1488