add 'translucent' block property

src/voxels/Block.cpp

@@ -140,6 +140,7 @@ void Block::cloneTo(Block& dst) {
     dst.inventorySize = inventorySize;
     dst.tickInterval = tickInterval;
     dst.overlayTexture = overlayTexture;
+    dst.translucent = translucent;
     if (particles) {
         dst.particles = std::make_unique<ParticlesPreset>(*particles);
     }

src/voxels/Block.hpp

@@ -172,6 +172,9 @@ public:
     /// @brief Turns off block item generation
     bool hidden = false;
 
+    /// @brief Block has semi-transparent texture
+    bool translucent = false;
+
     /// @brief Set of block physical hitboxes
     std::vector<AABB> hitboxes;