Leela Zero 0.12 + AutoGTP v14

• Optimized, fused Winograd transforms.
• Optimized final convolutions and OpenCL data transfer.
• Basic time management logic for non-self-play games.
• Stronger search due to improved FPU calculation.
• AutoGTP supports stop/resume (try q+Enter).
• Replace transposition table by network cache.
• Bugfixes to time management with tree reuse.
• Avoid some crashes on buggy OpenCL drivers.
• Avoid crashes when the user/GUI plays an illegal move.