minor add/improve/fix

#32
added

• added trade summary when declining INVALID_VALUE trade (5c727c1)
• mention if invalid items/overstocked trade accepted when enabling mention owner (5b7c4fe, ed812d0)
• added auto decline IValue note variable
  -- AUTO_DECLINE_INVALID_VALUE_NOTE variable added.

improved

• changed default boolean for overstocked overpay (d5d8b79, 54edbaf)

fixed

• fixed bot crashed when declining a trade (5423a13)