Pale oak, improved UI and more!

General

• Bumped pack format to 46

Textures

• Added new UI icons for various buttons (Thanks to @J0P )
• Added custom realm world type thumbnails
• Added pale oak textures
• Added campfire textures
• Added new music disc textures
• Added bamboo boat textures
• Added stonecutter textures
• Added grindstone textures
• Added new painting (Thanks to Kiklato)
• Updated UI widget textures (buttons, sliders etc.)
• Updated main menu panorama
• Fixed dispener and dropper horizontal front textures

Models

• Added pale oak trapdoor model