Allow collider modification after its insersion to the ColliderSet.

src/dynamics/coefficient_combine_rule.rs

@@ -21,6 +21,16 @@ pub enum CoefficientCombineRule {
 }
 
 impl CoefficientCombineRule {
+    pub fn from_value(val: u8) -> Self {
+        match val {
+            0 => CoefficientCombineRule::Average,
+            1 => CoefficientCombineRule::Min,
+            2 => CoefficientCombineRule::Multiply,
+            3 => CoefficientCombineRule::Max,
+            _ => panic!("Invalid coefficient combine rule."),
+        }
+    }
+
     pub(crate) fn combine(coeff1: Real, coeff2: Real, rule_value1: u8, rule_value2: u8) -> Real {
         let effective_rule = rule_value1.max(rule_value2);