gcode_macro: Use deepcopy() on get_status() results

If a get_status() method returns a mutable object (such as a list or
dict) then it would be possible for a gcode command template to
incorrectly alter the program's internal state.  Perform a deepcopy()
operation on all get_status() return results to avoid that.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/extras/query_endstops.py

@@ -8,7 +8,7 @@ class QueryEndstops:
     def __init__(self, config):
         self.printer = config.get_printer()
         self.endstops = []
-        self.last_state = {}
+        self.last_state = []
         # Register webhook if server is available
         webhooks = self.printer.lookup_object('webhooks')
         webhooks.register_endpoint(