Restore rapid-fire anti-cheat for projectiles

For a while we had made the temporary rapid-fire anti-cheat optional on
master, but had removed it entirely on the refactor branch. The
modification on master was acidentally only applied to the regular
(non-projectile) combat handler, while the removal on refactor removed
both that and the projectile check.

When the refactor branch was merged, that resulted in the removal of
only the projectile rapid-fire check, while the conditional regular
combat rapid-fire check was kept.

This change restores the projectile rapid-fire check such that it is
conditional, just like for regular combat.

src/Combat.cpp

@@ -365,7 +365,7 @@ static std::pair<int,int> getDamage(int attackPower, int defensePower, bool shou
     return ret;
 }
 
-static bool checkRapidFire(CNSocket *sock, int targetCount) {
+static bool checkRapidFire(CNSocket *sock, int targetCount, bool allowManyTargets) {
     Player *plr = PlayerManager::getPlayer(sock);
     time_t currTime = getTime();
 
@@ -377,7 +377,7 @@ static bool checkRapidFire(CNSocket *sock, int targetCount) {
     plr->lastShot = currTime;
 
     // 3+ targets should never be possible
-    if (targetCount > 3)
+    if (!allowManyTargets && targetCount > 3)
         plr->suspicionRating += 10001;
 
     // kill the socket when the player is too suspicious
@@ -396,7 +396,7 @@ static void pcAttackNpcs(CNSocket *sock, CNPacketData *data) {
     auto targets = (int32_t*)data->trailers;
 
     // kick the player if firing too rapidly
-    if (settings::ANTICHEAT && checkRapidFire(sock, pkt->iNPCCnt))
+    if (settings::ANTICHEAT && checkRapidFire(sock, pkt->iNPCCnt, false))
         return;
 
     /*
@@ -837,6 +837,10 @@ static void projectileHit(CNSocket* sock, CNPacketData* data) {
         return;
     }
 
+    // kick the player if firing too rapidly
+    if (settings::ANTICHEAT && checkRapidFire(sock, pkt->iTargetCnt, true))
+        return;
+
     /*
      * initialize response struct
      * rocket style hit doesn't work properly, so we're always sending this one