Tougher chance bugfix, icon resize, stat icon revamp.

Added IDS_TOUGHER to StatsMainMove() in statmain.c to prevent a debug error when the window is resized. Also added it to the tooltips in merintr.rc so when a player hovers the mouse over the tougher chance icon they can see the "Tougher Chance" text. Added IDS_TOUGHER to merintrc.h with the number 98 (Daenks please let me know if that's right, learning this as I go).

Separated the stat icon height and width so they can now differ, increased max stat icon size from 15 to 17 to handle the larger icon I've prepared for it.

Icons to come soon