add team to ProjectileParams wherever projectiles are spawned

This adds better support for shields to handle projectiles and removes some mysteriousness to how they are handled.

I've excluded lightning sparks specifically since they deny their ownerID (it is always -1) and how would lightning know who's who, anyway (how, indeed, would any projectile know its own team, but whatever).

Author: efrec

luarules/gadgets/unit_custom_weapons_behaviours.lua

@@ -36,6 +36,7 @@ local spGetProjectileTimeToLive = Spring.GetProjectileTimeToLive
 local spGetProjectileVelocity = Spring.GetProjectileVelocity
 local spGetUnitIsDead = Spring.GetUnitIsDead
 local spGetUnitPosition = Spring.GetUnitPosition
+local spGetUnitTeam = Spring.GetUnitTeam
 local spGetUnitWeaponState = Spring.GetUnitWeaponState
 local spGetUnitWeaponTarget = Spring.GetUnitWeaponTarget
 local spSetProjectilePosition = Spring.SetProjectilePosition
@@ -147,27 +148,29 @@ do
 		speed   = { 0, 0, 0 },
 		gravity = gravityPerFrame,
 		ttl     = 3000,
+		owner   = -1,
+		team    = -1,
 	}
 
 	---@return integer weaponDefID
 	---@return ProjectileParams projectileParams
 	---@return number parentSpeed
 	getProjectileArgs = function(params, projectileID)
-		local weaponDefID = params.speceffect_def
-
 		local projectileParams = projectileParams
+		projectileParams.cegTag = params.cegtag
+		projectileParams.model = params.model
+		local weaponDefID = params.speceffect_def
+		local ownerID = spGetProjectileOwnerID(projectileID)
+		projectileParams.owner = ownerID or -1
+		projectileParams.team = spGetUnitTeam(ownerID) or -1
 
 		local pos = projectileParams.pos
 		pos[1], pos[2], pos[3] = spGetProjectilePosition(projectileID)
 
 		local vel = projectileParams.speed
-		local parentSpeed
+		local parentSpeed;
 		vel[1], vel[2], vel[3], parentSpeed = spGetProjectileVelocity(projectileID)
 
-		projectileParams.owner = spGetProjectileOwnerID(projectileID)
-		projectileParams.cegTag = params.cegtag
-		projectileParams.model = params.model
-
 		return weaponDefID, projectileParams, parentSpeed
 	end
 end

luarules/gadgets/unit_custom_weapons_cluster.lua

@@ -67,6 +67,7 @@ local spGetProjectileDefID    = Spring.GetProjectileDefID
 local spGetUnitDefID          = Spring.GetUnitDefID
 local spGetUnitPosition       = Spring.GetUnitPosition
 local spGetUnitRadius         = Spring.GetUnitRadius
+local spGetUnitTeam           = Spring.GetUnitTeam
 local spGetUnitsInSphere      = Spring.GetUnitsInSphere
 local spSpawnProjectile       = Spring.SpawnProjectile
 local spDeleteProjectile      = Spring.DeleteProjectile
@@ -402,6 +403,7 @@ local function spawnClusterProjectiles(data, x, y, z, attackerID, projectileID)
 
 	local params = spawnCache
 	params.owner = attackerID or -1
+	params.team = spGetUnitTeam(attackerID)
 	params.ttl = data.weaponTtl
 	local speed = params.speed
 	local position = params.pos