jEveAssets 5.7.0

New Features:
-Major optimization of settings IO
-Allow unchecking all unknown locations in the tracker assets filter
-Tracker assets filter search
-Import tracker data from file
-Added issued by column to market orders
-Updated jmemory (Warn on 32bit Java and better error messages)
-Now run with jmemory after update (if jmemory was used to start jEveAssets)
-More memory optimiaztions
-Better handling of structure assets

Bug Fixes:
-Tracker purge removed too much
-Asset safety is not an unknown location