*replase postfix iterator increment\decrement with prefix in cycles
*replase strlen(*char) != 0 with *char[0] != '\0'
*replase strlen(rStr.c_str()) with rStr.length()
Also get ride of hack in Player::HandleBaseModValue now it's unnecessary.
Fixes: #855, multiplicative % count for normal school for aura 79 and may be others.
Chaplain