Implement collision clash type (pure tri intersection regardless of protrusion)

This should be equivalent to select(element) but faster and with an allow_touching toggle.

src/ifcopenshell-python/ifcopenshell/geom/main.py

@@ -190,6 +190,16 @@ class tree(ifcopenshell_wrapper.tree):
         args = [self, unwrap(value), tolerance]
         return [entity_instance(e) for e in ifcopenshell_wrapper.tree.clash_intersection(*args)]
 
+    def clash_collision(self, value, allow_touching=False):
+        def unwrap(value):
+            if isinstance(value, entity_instance):
+                return value.wrapped_data
+            return value
+
+        args = [self, unwrap(value), allow_touching]
+        return [entity_instance(e) for e in ifcopenshell_wrapper.tree.clash_collision(*args)]
+
+
 
 def create_shape(settings, inst, repr=None):
     """