Support for attribute config and several bug fixes

Feature
Let the slider control an attribute
Light:

• brightness_pct (default)
• brightness
• color_temp
• hue
• saturation

Cover:

• position (default)
• tilt

Fixes

• Apply color_temp on slider for lights
• Fix lights that behave as switches (color_mode = onoff)
• Toggle option now toggles instead of setting value to max

Beta for attributes on light and cover

See #61

Fix visual editor bug

Hopefully fixes the visual editor bugs some users are reporting.

Show correct cover icons by device class

Supported device classes for cover:

• blind
• door
• garage
• shutter
• window

Fallback to window for other device classes.

Lovelace editor fixes

Hopefully fixes some errors in the editor reported by some users:
Changes made in editor for slider didn't reflect to config.

Add support for media_player entities

v1.5.0

1.5.0

Improvement for unavailable entity

Icons and label will now gray out if entity is unavailable.

Add Polish and Russian language

Add Polish and Russian language for UI editor

Reverse cover logic

v1.4.0

1.4.0

Support for Safari, iOS & Firefox

Support added for

• Safari
• iOS Companion app (still a minor bug when releasing touch off the card)
• Firefox