nav: added fall control so that bots now take a new path when falling from heights.

nav: increase player avoidance distance.
combat: added zoom check for better use of the sniper gun (inspired by podbot).

src/manager.cpp

@@ -1467,6 +1467,11 @@ void Bot::newRound () {
 
    m_timeDoorOpen = 0.0f;
 
+   for (auto &fall : m_checkFallPoint) {
+      fall = nullptr;
+   }
+   m_checkFall = false;
+
    resetCollision ();
    resetDoubleJump ();