Assemble 1.21.20

[dries-c]

Introduction

This PR updates PM5 to 1.21.20

CAUTION: this requires you to manually modify bedrock-data & bedrock-protocol

Changes

Backwards compatibility

See pmmp/BedrockProtocol#260

[IvanCraft623]

Some missing things:

• Doors of different materials will now be able to form a double door, eg. oak with iron door (hinge)
• End Stone Brick Slab now has a hardness of 3
• Infested Cobblestone now has a hardness of 1
• Mossy Stone Brick Slab now has a hardness of 1.5
• Mushroom Blocks: The chance of dropping mushrooms (max of 2) from brown and red mushroom block was increased to match Java Edition, from 10% per mushroom to 11.11%.
• Mushroom Stem no longer drops mushrooms when mined
• Prismarine Double Slab, Dark Prismarine Double Slab, Prismarine Bricks Double Slab, Andesite Double Slab, Polished Andesite Double Slab, Diorite Double Slab, Polished Diorite Double Slab, Granite Double Slab, Polished Granite Double Slab, and Mossy Stone Brick Double Slab now have a hardness of 1.5
• Prismarine Slab, Dark Prismarine Slab, Prismarine Bricks Slab, Andesite Slab, Polished Andesite Slab, Diorite Slab, Polished Diorite Slab, Granite Slab, and Polished Granite Slab They now have a hardness of 1.5
• Smooth Sandstone now has a hardness of 2 and a blast resistance of 6
• Smooth Red Sandstone now has a hardness of 2

Source

[IvanCraft623]

Hardness updates can be managed thorugh #6378

[dktapps]

Gameplay updates can be done separately, it's not relevant to protocol update integration

[IvanCraft623]

All changes looks OK