AiPlayer run animation fix

In TGE/TSE, AiPlayers seem unable to keep the forward animation playing properly (it keeps resetting, causing a jerky movement, or making the bots "skate" completly) when one of the following conditions are met:

- The bot is moving very slowly;
- The framerate is very low;
- The network is overloaded (lag, packet loss, etc.)

After some debugging, it turned out that AI-controlled players were setting their velocity to (0,0,0) in client-side during some proccessTick() calls, causing the root animation to be played instead of the run one. Since this only happens sometimes, it causes the run animation to reset, and the rate at which zero'ed velocities are generated increases a lot when the bot's speed decreases (as example, when you use the slowDown flag in setMoveDestination), and there are framerate/network performance issues.

The problem happens due to Player::updateMove() being called on AiPlayer ghosts. AiPlayers generate a move in processTick(), but only on the server. On client-side, they are supposed to move based only on velocity/rotation/delta information sent from the server. Since their ghosts never generate moves, updateMove always calculate zero velocities on the client side.

When the framerate is high enough, and when the network isn't lagging, a packet will always arrive with the correct movement information before the AiPlayer can decide which animation to play. But if a packet gets too late, the animation will be decided based on zero velocity (I'm not entirely sure why it simply fails when the AiPlayer is moving slowly enough).

To view the problem, load the starter.fps demo, enter the editor and view kork's ID, then type this on the console:

(kork id).setMoveSpeed(0.1);

Now go watch Kork walking around. He can barely play the run animation at that speed, and will mostly "skate" along the path.

To fix the issue, add these mere two lines on top of the Player::updateMove() method in player.cc:

if (!getControllingClient() && isGhost())
    return;

This prevents updateMove from being called on AiPlayer ghosts once for all. Load the starter.fps again and make Kork walk slowly again. He should play the animation without problems now, not matter how slow it's moving.

--EDIT--
With the advent of TGEA 1.7, the fix might cause AiPlayers to not animate when moving randomly. This is caused by mJetting. To fix this, add this to Player::Player():

mJetting = false;

The darn thing relied on UpdateMove to get a value, so it used memory garbage instead for fixed AiPlayers. If you want your AiPlayers to jet, you'll need to add mJetting to packUpdate() and unpackUpdate(), as well as set the flag to true in AiPlayer::getAiMove().