TFC Structures - Better Mineshafts

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mod adding a Mineshafts structure to the TFC world.
The mod is based on Better Mineshafts by Yung.
There are several different mineshafts in different biomes of the TFC world.
Are generated in badlands, plains, mountains, plateu, lowlands, hills, low canyons and oceans
In each biome a different structure can be generated, looking different, with different loot chests


- expanded Mineshafts structure
- hidden rooms mazes and additional loot chests
- Loot chests have TFC items, while 
- Vanilla Blocks dropped items TFC 
- the structure itself is unchanged to prevent block subsidence.
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