Created new classes in TreasureSource\Logic

new classes created:
LootCalc, LooDice, LootIO, LootBuilder, LootList, LootListNoDuplicates,
LootItem

Populated all classes except for LootItem with data members,
constructors, getters and setters.  Built some methods for getting
random numbers from LootDice.
Modified members of LootClac to include LootPrefs