New Devices

• T5E WF thermostat #197
• Sendo air conditioner #239

Improvements to devices

• Lefant vacuum: added an additional error code

General imrpovements

• Updated tests for increased number of retries before deciding device is offline
• Cover: refactor to reduce complexity and improve test coverage #228
• Siren: make is_on work correctly #198
• device config helper: refactor to reduce complexity and improve test coverage
• inverted dps: avoid exception when the value is not numeric #241
• light: avoid exception when the color_temp is not numeric #241

Documentation changes

• mention single connection limitation of most Tuya devices #225