Trainer: added option for all models

Enable autobackup? (y/n ?:help skip:%s) :
Autobackup model files with preview every hour for last 15 hours. Latest backup located in model/<>_autobackups/01

SAE: added option only for CUDA builds:
Enable gradient clipping? (y/n, ?:help skip:%s) :
Gradient clipping reduces chance of model collapse, sacrificing speed of training.

models/Model_DEV_POSEEST/Model.py

@@ -12,6 +12,7 @@ class Model(ModelBase):
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs,
+                            ask_enable_autobackup=False,
                             ask_write_preview_history=False,
                             ask_target_iter=False,
                             ask_sort_by_yaw=False,