Rerwite is moving allowed logic + fix root flag heartbeat spam (mod-playerbots#1908)

Okay, what have been done:

1. Fix heartbeat spam for root flag: check against `MOVEMENTFLAG_ROOT`
flag (`IsRooted`) instead of `HasRootAura`.
2. Rewrite `IsMovingAllowed` - place checks from most common to the
rarest.
3. Remove unnecessary checks: `HasRootAura`, `HasConfuseAura`,
`HasStunAura` - handled by AuraEffects and set unit state flags
`UNIT_STATE_ROOT`, `UNIT_STATE_CONFUSED`, `UNIT_STATE_STUNNED` -
`UNIT_STATE_LOST_CONTROL` already handles confused and stunned (rooted
checked with `IsRooted` method).
4. Combine traveling state checks for taxi flights:
`UNIT_STATE_IN_FLIGHT` + MM flag `FLIGHT_MOTION_TYPE`.
5. Simplify check against being in vehicle: use
`MOVEMENTFLAG_ONTRANSPORT` as an indicator that the unit is in the
vehicle.

Also, update `UpdateMovementState` method with simplified checks and the
updated logic (common > rare).

This should fix issues:
mod-playerbots#1903 and
mod-playerbots#1902

NOTE: The `PlayerbotAI` class has a method `CanMove` with the same
checks, but this method is only used once in the code. We should decide
how to properly check if the bot can move or not:

1. Place all logic into `IsMovingAllowed` and drop `CanMove`.
2. Place all logic into `CanMove` and use it inside `IsMovingAllowed`.
3. Use them for different approaches: 
- `CanMove`: simple checks (unit flags, CC state, death state, travel
state, vehicle state);
- `IsMovingAllowed`: everything from `CanMove` + MM flags checks (not
sure about rooted since it still checks for movement flags...).

Author: privatecore

src/strategy/actions/MovementActions.cpp

@@ -946,38 +946,48 @@ bool MovementAction::IsWaitingForLastMove(MovementPriority priority)
 
 bool MovementAction::IsMovingAllowed()
 {
-    // do not allow if not vehicle driver
-    if (botAI->IsInVehicle() && !botAI->IsInVehicle(true))
+    // Most common checks: confused, stunned, fleeing, jumping, charging. All these
+    // states are set when handling certain aura effects. We don't check against
+    // UNIT_STATE_ROOT here, because this state is used by vehicles.
+    if (bot->HasUnitState(UNIT_STATE_LOST_CONTROL))
         return false;
 
-    if (bot->isFrozen() || bot->IsPolymorphed() || (bot->isDead() && !bot->HasPlayerFlag(PLAYER_FLAGS_GHOST)) ||
-        bot->IsBeingTeleported() || bot->HasRootAura() || bot->HasSpiritOfRedemptionAura() || bot->HasConfuseAura() ||
-        bot->IsCharmed() || bot->HasStunAura() || bot->IsInFlight() || bot->HasUnitState(UNIT_STATE_LOST_CONTROL))
+    // Death state (w/o spirit release) and Spirit of Redemption aura (priest)
+    if ((bot->isDead() && !bot->HasPlayerFlag(PLAYER_FLAGS_GHOST)) || bot->HasSpiritOfRedemptionAura())
+        return false;
+
+    // Common CC effects, ordered by frequency: rooted > frozen > polymorphed
+    if (bot->IsRooted() || bot->isFrozen() || bot->IsPolymorphed())
         return false;
 
+    // Check for the MM controlled slot types: feared, confused, fleeing, etc.
     if (bot->GetMotionMaster()->GetMotionSlotType(MOTION_SLOT_CONTROLLED) != NULL_MOTION_TYPE)
-    {
         return false;
-    }
 
-    // if (bot->HasUnitMovementFlag(MOVEMENTFLAG_FALLING))
-    // {
-    //     return false;
-    // }
-    return bot->GetMotionMaster()->GetCurrentMovementGeneratorType() != FLIGHT_MOTION_TYPE;
+    // Traveling state: taxi flight and being teleported (relatively rare)
+    if (bot->IsInFlight() || bot->GetMotionMaster()->GetCurrentMovementGeneratorType() == FLIGHT_MOTION_TYPE ||
+        bot->IsBeingTeleported())
+        return false;
+
+    // Vehicle state: is in the vehicle and can control it (rare, content-specific).
+    // We need to check charmed state AFTER vehicle one, cuz that's how it works:
+    // passengers are set to charmed by vehicle with CHARM_TYPE_VEHICLE.
+    if ((bot->HasUnitMovementFlag(MOVEMENTFLAG_ONTRANSPORT) && !botAI->IsInVehicle(true)) ||
+        bot->IsCharmed())
+        return false;
+
+    return true;
 }
 
 bool MovementAction::Follow(Unit* target, float distance) { return Follow(target, distance, GetFollowAngle()); }
 
 void MovementAction::UpdateMovementState()
 {
     const bool isCurrentlyRestricted = // see if the bot is currently slowed, rooted, or otherwise unable to move
+        bot->HasUnitState(UNIT_STATE_LOST_CONTROL) ||
+        bot->IsRooted() ||
         bot->isFrozen() ||
-        bot->IsPolymorphed() ||
-        bot->HasRootAura() ||
-        bot->HasStunAura() ||
-        bot->HasConfuseAura() ||
-        bot->HasUnitState(UNIT_STATE_LOST_CONTROL);
+        bot->IsPolymorphed();
 
     // no update movement flags while movement is current restricted.
     if (!isCurrentlyRestricted && bot->IsAlive())