Fix: destroy laser tower effect and particle when one of tethered towers is destroyed

Fix: do not allow building Laser Tower on walls (apply same check as for other towers)

Give bot a handicap in form of icreased attack aura so he played approximately as good as a player
Give Phase Shift to Dire builders to dodge tower projectiles
Give a bit of gold in addition to XP to Dire heroes for standing near a dying creep
Split XP between Dire heroes if there are more than one near a dying creep

Forbid building towers where creeps can not reach them
Order stuck creeps to simply attack nearest tower
Make spawning tower temporarily phased on spawn to prevent spawned creeps to being spawned on wrong side and stuck
Make all towers agro priority lower than hero

Balance: make creeps stronger in the beginning

Make startup blink dagger cost 12 golds

Balance: decrease range barrack up per time from 1.25 to 1.20 and show the number in description
Balance: make creeps slightly stronger in the middle
Make it impossible to target dragons/bosses with midas/dominator

Make barracks always phased so they did not block path to spawned creeps

Balance: increase game over time from 20 to 23 minutes

Prison tower balance