update Interface to 50400
add achievements of killing rare elite
adjust layout of NPCScan/Config/Search
show cached or completed status before names of npcs on WorldMap
add Zandalari Warscout and Zandalari Warbringer
add simple point-type npc path data, and add some npc data to test
fix bugs, so that it could show point-type npc as skull icon.
new bug found: Ran out of unique path colors.
There is only 11 colors. Point-type path of npc should not use colors.
So I comment out _NPCScan.Overlay.PointData.lua in _NPCScan.Overlay.toc temporarily.