New Feature: Multi-turn actions allow mercs to perform actions intended on a specific gridno over multiple turns. Currently demonstrated on the adding/removing/filling of sandbags.

git-svn-id: https://ja2svn.dyndns.org/source/ja2/trunk/GameSource/ja2_v1.13@5777 3b4a5df2-a311-0410-b5c6-a8a6f20db521
Fix: forgot to continously check for items

git-svn-id: https://ja2svn.dyndns.org/source/ja2/trunk/GameSource/ja2_v1.13@5778 3b4a5df2-a311-0410-b5c6-a8a6f20db521