make TechniqueDisk and Tool Copy

src/entity/item/tech.rs

@@ -25,7 +25,7 @@ pub enum Technique {
 }
 
 
-#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
 pub struct TechniqueDisk {
     pub tech: Technique,
     pub level: u32,

src/entity/item/tool.rs

@@ -394,7 +394,7 @@ impl ToolType {
 }
 
 
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Copy, Clone, Debug, PartialEq)]
 pub struct Tool {
     pub tool: ToolType,
 }