Core/Movement: merged Collision height handling from 335 branch to reduce the probability that creatures are falling under the map

src/common/Collision/DynamicTree.cpp

@@ -221,7 +221,7 @@ bool DynamicMapTree::isInLineOfSight(G3D::Vector3 const& startPos, G3D::Vector3
 
 float DynamicMapTree::getHeight(float x, float y, float z, float maxSearchDist, PhaseShift const& phaseShift) const
 {
-    G3D::Vector3 v(x, y, z + 0.5f);
+    G3D::Vector3 v(x, y, z);
     G3D::Ray r(v, G3D::Vector3(0, 0, -1));
     DynamicTreeIntersectionCallback callback(phaseShift);
     impl->intersectZAllignedRay(r, callback, maxSearchDist);