restructure project

src/td/game/towers/IceTower.cpp

@@ -0,0 +1,22 @@
+#include "td/game/Towers.h"
+#include "td/game/World.h"
+
+namespace td {
+namespace game {
+
+void IceTower::Tick(std::uint64_t delta, World* world) {
+	if (m_Timer.Update(delta)) {
+		float damage = GetStats()->GetDamage();
+		for (MobPtr mob : world->GetMobList()) {
+			if (IsMobInRange(mob)) {
+				mob->AddEffect(EffectType::Slowness, 1, this);    // slowness for 1s every second
+				if (damage > 0)
+					world->GetMobNotifier().NotifyListeners(&MobListener::OnMobDamage, mob.get(), damage, this);
+				m_Timer.ApplyCooldown();
+			}
+		}
+	}
+}
+
+} // namespace game
+} // namespace td