Bots fly/follow (movePoint core refactor), water walking fixes (#1825)

Closer the original solution, i dont wanna drift to much away without
really good reason. At this point i still see NPC and bots moving
through the levels or even falling out the levels here and there. I
verified whether the MovePoint signature changes and related params
itself in playerbots has anything todo with it, even when params are
hardcoded the behavior remains. It could be deeper problem, but for now
it seems core problem. Therefore i dont wanna change to much until the
dust has settled a bit in core itself.

I havent implemented moveTakeOff or moveLand which are basically
responsible for the transitions phases between ground and air visa
versa. I have version where i use takeOff for the animation, which means
moving vertical. For now i am gonna leave for what it is.

PS: also includes additional movement fix for AreaTriggerAction which we
missed first time after the core update on movements.

@Wishmaster117 Been testing and trying a lot in the background on find
solutions and causes. The general solutions remains removed some tweaks,
altered code here and there. With the general idea to keep closer to the
original code for now at least.

Testing:
- Class abilities: Slow fall (priest), Flight Form (druid) : Green
- BG: Green
- Swimming and walking shallow waters: Green
- Takeoff and land when following master: Green
- Boat and zeppelins: Green
- Flymount and ground walking: Green
- Water Walking (shaman), Path of Frost (DK): Green
- Water Walking (shaman), Path of Frost (DK) transisions; flying,
swimming, water walking: Green


Skipping pets when group water walking, path of frost, once core pathing
changes has settled more i will add it. Which is easy but i dont wanna
add more edge cases and code branches for now.

src/strategy/actions/CheckMountStateAction.cpp

@@ -81,7 +81,7 @@ bool CheckMountStateAction::isUseful()
     // to mostly be an issue in tunnels of WSG and AV)
     float posZ = bot->GetPositionZ();
     float groundLevel = bot->GetMapWaterOrGroundLevel(bot->GetPositionX(), bot->GetPositionY(), posZ);
-    if (!bot->IsMounted() && posZ < groundLevel)
+    if (!bot->IsMounted() && !bot->HasWaterWalkAura() && posZ < groundLevel)
         return false;
 
     // Not useful when bot does not have mount strat and is not currently mounted