Fixing POIFinder for the custom branch

[gm9]

TreeMos,

attached is the version I had previously talked about. Updates the POI list automatically whenever the map changes (this is now done via an OnMapChange Event that is triggered by EQ2MAP and that the EQ2MAP team added, so every plugin can use that).

Also the Show POI Finder button now changes to a Hide POI Finder button where appropriate.

Finally I moved the buttons to the lower left corner of the map window. I think it's less in the way down there, but of course that's just a suggestion, do as you like.