ai: add forced move logic

Do not search anything on a forced board
main: add result notification for player

Also, sleep a second before exiting so fairymax can print the outcome of
the game (so we can compare)
defconfig: remove CFG_EXTEND

It doesn't exist anymore
boardEval: fix index and mask bugs

Commit Harakiri afterwards
ai.c: remove math.h header
machineMove: do not do iterative deepening
quiesce: fallback to negamax on checks
negamax: major changes

When will I learn...
boardEval: remove castlePoints array and use a switch