Fixing issue #35: Ship Odyssey: Rat min max values wrong

"number of rats to send at a time" current/min/max values are set once at the start of the first game,
and after a level change.  The current value will then stay under user control as long
as it is within the level's min and max values.
Initial, Min and max for Levels 1-2 are now 100,100-500.
Initial, Min and max for Levels 3-4 are now 10,1-500.
ShipOdyssey.mxml:
Fixed by consolidating code to change min/max/current values into method setCurrentMixMaxRats().  Renamed game variables from "k" prefix to "m" prefix
because they are not constants, they change from level to level.