Adds effects for changing target stats.

pkmn_lib_interface/src/app_interface/static_data/effect_parameter.rs

@@ -35,6 +35,35 @@ impl EffectParameter {
             }
         }
     }
+    
+    pub fn as_bool(&self) -> bool {
+        if let EffectParameter::Bool(b) = self {
+            return *b;
+        }
+        panic!("Unexpected effect parameter type: {}", self);
+    }
+
+    pub fn as_int(&self) -> i64 {
+        if let EffectParameter::Int(i) = self {
+            return *i;
+        }
+        panic!("Unexpected effect parameter type: {}", self);
+    }
+
+    pub fn as_float(&self) -> f32 {
+        if let EffectParameter::Float(f) = self {
+            return *f;
+        }
+        panic!("Unexpected effect parameter type: {}", self);
+    }
+
+    pub fn as_string(&self) -> StringKey {
+        if let EffectParameter::String(s) = self {
+            return s.clone();
+        }
+        panic!("Unexpected effect parameter type: {}", self);
+    }
+
 }
 
 #[cfg(not(feature = "mock_data"))]