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/save_variables.py

@@ -57,7 +57,7 @@ class SaveVariables:
         gcmd.respond_info("Variable Saved")
         self.loadVariables()
     def get_status(self, eventtime):
-        return {'variables': dict(self.allVariables)}
+        return {'variables': self.allVariables}
 
 def load_config(config):
     return SaveVariables(config)