Implement info updates during searcch

[ArcticXWolf]

Split from #2:

for showing thinking (has nothing to do with ponder) usually uci programs (and xboard too) output thinking while calculating. In uci this is done with info lines (depth-score-nodes-time at least). I noticed that AXW outputs one info line finally per move BUT after the sent bestmove, which is probably the reason it is not recorded into the game file by the GUI.

example from Stockfish 11 (not all fields are mandatory ofc, like tbhits, nps, multipv etc...)

ucinewgame
isready
readyok
position startpos moves g1f3 d7d5 d2d3 g8f6 g2g3 c8g4
go wtime 120000 btime 120000 movestogo 37
info depth 1 seldepth 1 multipv 1 score cp 64 nodes 35 nps 17500 tbhits 0 time 2 pv f3e5
info depth 2 seldepth 2 multipv 1 score cp 92 nodes 100 nps 50000 tbhits 0 time 2 pv c2c3 g4f3
info depth 3 seldepth 3 multipv 1 score cp 92 nodes 176 nps 58666 tbhits 0 time 3 pv c2c3 g4f3 e2f3
info depth 4 seldepth 4 multipv 1 score cp 137 nodes 263 nps 65750 tbhits 0 time 4 pv f3e5 c7c6
info depth 5 seldepth 5 multipv 1 score cp 196 nodes 379 nps 94750 tbhits 0 time 4 pv f3e5 c7c6
info depth 6 seldepth 6 multipv 1 score cp 23 nodes 2392 nps 299000 tbhits 0 time 8 pv f3e5 g4f5 b1d2 b8d7 e5d7 d8d7
info depth 7 seldepth 8 multipv 1 score cp 50 nodes 3320 nps 332000 tbhits 0 time 10 pv f3e5 g4f5 d1d2 b8d7 d2f4
info depth 8 seldepth 12 multipv 1 score cp 46 nodes 7714 nps 482125 tbhits 0 time 16 pv f3e5 g4f5 b1d2 b8d7 d2f3 e7e6 c2c3
info depth 9 seldepth 11 multipv 1 score cp 45 nodes 12170 nps 507083 tbhits 0 time 24 pv f3e5 g4f5 c1f4 b8d7 b1d2 e7e6 e5d7 d8d7 f4e5

AXW 0.07

position startpos
2021/04/21 11:09:51 Position: [startpos]
go wtime 120000 btime 120000 movestogo 37
bestmove e2e4
info depth 5 score cp 11 nodes 213705 nps 64877 time 3294
2021/04/21 11:10:12 Move: e2e4, Info: info depth 5 score cp 11 nodes 213705 nps 64877 time 3294
2021/04/21 11:10:12 TranspositionTable: 19955 / 2684354