Update to Imanel Silversword encounter

Moving Impanel Silversword closer to the road into Baldur’s Gate in
BGEE to make it more likely to encounter her.  Does not affect
Tutu/BGT..
Also checks to Imanel’s script blocks.
1. Add “Global("P#EMMAFight","GLOBAL”,0)” check to /* Sees Kivan in
Party */ block to prevent Imanel from re-initiating dialog.
2. Add “CombatCounter(0)” check to /* Talks to Party */
block to prevent Imanel from initiating conversation during battle.