[FEATURE] Covers with slat position

[h4de5]

vimar does have covers with slat position - here is an example

2020-09-30 15:32:17 WARNING (SyncWorker_3) [custom_components.vimar_platform.vimarlink] Unknown object returned from web server: CH_Shutter_Slat_Automation / Tapparella studio
2020-09-30 15:32:17 DEBUG (SyncWorker_3) [custom_components.vimar_platform.vimarlink] Unknown object has states: {‘slat_position’: {‘status_id’: ‘496’, ‘status_value’: ‘0’, ‘status_range’: ‘min=0|max=100’}, ‘position’: {‘status_id’: ‘500’, ‘status_value’: ‘0’, ‘status_range’: ‘min=0|max=100’}, ‘clockwise/counterclockwise’: {‘status_id’: ‘504’, ‘status_value’: ‘0’, ‘status_range’: ‘’}, ‘stop up/stop down’: {‘status_id’: ‘505’, ‘status_value’: ‘0’, ‘status_range’: ‘’}, ‘up/down’: {‘status_id’: ‘507’, ‘status_value’: ‘0’, ‘status_range’: ‘min=0|max=1’}}

[h4de5]

should be fixed with 60d6d28