Warhead only affects owner house's unit

Warhead with AffectsAllies=yes will also affect your allies(teammates)' unit.
Add a tag like AffectsFriendlies=yes/no to determind if they can be affected.

It is for a simple Upgrade system emulation.
eg. Tank Armor Upgrade.
You need to build and place an invisible and immune building which keeps firing a weapon with screen-wide warhead with Armor AttachEffect(CellSpread=300,AffectsAllies=yes, AffectsFriendlise=no,AffectsEnemies=no).
This can upgrade armor of all your newly-produced and existing tanks on the map.
But your allies need to build their own upgrade to get the same bonus.