feat: add tower detection

include/game/Towers.h

@@ -32,9 +32,9 @@ enum class TowerType : std::uint8_t {
     TowerCount
 };
 
-enum class TowerSize : bool {
-    Little = 0, // 3x3
-    Big,        // 5x5
+enum class TowerSize : std::uint8_t {
+    Little = 3, // 3x3
+    Big = 5,        // 5x5
 };
 
 enum class TowerPath : std::uint8_t {

include/game/World.h

@@ -162,6 +162,8 @@ public:
     bool CanPlaceLittleTower(const glm::vec2& worldPos, PlayerID player) const;
     bool CanPlaceBigTower(const glm::vec2& worldPos, PlayerID player) const;
 
+    TowerPtr GetTower(const glm::vec2& position); // returns null if no tower is here
+
     const std::unordered_map<ChunkCoord, ChunkPtr>& getChunks() const { return m_Chunks; }
 
     const Color& getSpawnColor(TeamColor color) const { return m_SpawnColorPalette[(std::size_t)color]; }