-Fixed roll function calling itself instead of direct_roll in Normal Mixed Big

-Fixed out-of-bounds bug

-Added Parallel and Mixed variations of rollers

-GM rollers are now invisible to spectators.

-Substituted small rollers in the bags.

-Fixed small roller bug when inputting text into modifier field.

-Fixed error message when trying to input negative values on the MOD button.

-Set random seed at load time according to http://lua-users.org/wiki/MathLibraryTutorial.

-Changed text for player rolling in secret

-Clear input in modifier space after it is no longer selected to provide clean slate for next input.