Wiserheatapiv2

What's Changed
- Amend json data sent when creating or assigning schedules
- Add schedule_level_type_id property
- Amend schedule_type to be Level for all level schedules
- Add system.opentherm property class - Issue 15
- Amend system.opentherm_connection status to be system.opentherm.connection_status
- Fix error if device does not report RSSI

What's Changed
- Fix issue assigning existing schedules to Level devices - Issue 12
- Fixed issue with schedule type in create_schedule

- Fix issue using wrong id for lights and shutter device command.
- Added identify method for Smart Plug
- Added new assign, create, delete functions to schedules
- Added new allow_add_devices method to system object to allow new device pairing
- Added new add and delete methods on room object to create/delete room
- Added detected_networks property to system.network object
- Added connect_to_network method to allow changing wifi connection on hub
- Removed unused get_by_room_name on device s collection

- Add onoff lights to light types
- Updated documentation
- Removed unused function get_by_room_name for devices

- Fix for schedule id returning None in light.py and shutter.py
- Rearchitected capabilities class
- Fix for command issue for current_lift in shutter.py
- Rename output_range to minimum and maximum from min/max in light.py
- Added product_identifier and product_model properties to devices
- Added manual_level, override_level and scheduled_percentage properties to light.py
- Added comfort_mode_score, control_direction, demand_type, displayed_setpoint and heating type properties to room.py
- Added version property to api
- Added available modes to lights and shutters collection
- Rearchitected how api holds and manages schedules
- Added schedule_id property to smartplugs and hot water

Initial release of a new Wiser Heathub API utilising the v2 hub api