[z2102] Improve AreaTrigger teleport requirement checks

Implement AreaLockStatus concept by rsa

Also drop basicly unneeded `areatrigger_teleport`.required_failed_text field.
This concept is still in testing phase, please feedback results of some glitches that might exist!

TODO: Use Player::GetAreaLockStatus or GetAreaTriggerLockStatus for other "CanEnter" checks as well.

Signed-off-by: Schmoozerd <schmoozerd@scriptdev2.com>

(based on commit [12148] - 8ff1eb4)

(based on commit [s1723] - 95502d4)