replacing obsolete SiegeCannon definition

Assets/_Project/Definitions/Towers/SiegeCannon.asset

@@ -1,37 +0,0 @@
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-  m_Name: SiegeCannon
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-  DisplayName: Siege Cannon
-  Description: Ground-only. Lobs a ballistic shell that deals splash damage around the
-    point of impact.
-  FootprintSize: {x: 2, y: 2}
-  GoldCost: 60
-  BuildTime: 0.5
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-  DamageType: 0
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-  Damage: 25
-  Range: 16
-  FireRate: 1
-  SplashRadius: 4
-  ChainCount: 0
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