Remove technic (fix issue #77) (#78)

nether added technic support on April 29, and technic added nether support on May 1, resulting in them both optionally depending on each other and becoming incompatible with each other.

To resolve this, technic will keep the nether support, the compressor recipe has been moved into technic (minetest-mods/technic#644), and this commit reverts the technic-related parts of a6d1f55, removing the technic dependency.

Technic and Toolranks support (#73)

Co-authored-by: Treer <[email protected]>

Hide unknown nodes under the nether bug (#72)

Hides bug #51 - the node_stone of the biome appears in the whole chunk under the Nether, so make nether:native_mapgen look the same as default:stone, and drop whatever default:stone drops

Add giant crystal geodes (#35)

Treasures (#50)

* Add Netherrack slabs and walls

Also adds deep netherrack stairs, and deep nether brick stairs, slabs, inner stairs and outer stairs.
Adds 9 new nodes in total.

* Treasure: Nether pickaxe takes 10x less wear damage when mining netherrack

cracky-3 mining time of Nether pickaxe reduced from 0.4 to 0.3 to mine netherrack faster.
maxlevel of nether pickaxe dropped from 3 to 2 to increase wear damage with non-netherrack nodes.

* Treasure: Nether staff of light

Adds "Nether staff of Light" and "Nether staff of Eternal Light"
One is limited to 60 uses, and the other has unlimited uses but the glowstone it creates will only last for 40 seconds.
There are no crafting recipes as I hope these to eventually be treasure that can be found in the nether.

See the pull request (#50) for more discussion

Switch Deep-netherbrick to a texture with licence allowing adaption &…

… redistribution (CC BY-SA 4.0)

To fix #52, while trying to capture some of the feel of the original texture.

Make ShiftExistingBiomes available via API (#40)

* bug fixes

Fixes wrong new_y_min when shift_existing_biomes() shifts a biome below the nether floor,
find_surface_anchorPos() no longer assumes y=0 will be outside the nether.
Nil-reference fixed when a mods tries to register a portal after mods are finished loading, but the portal shape+material was already registered by another mod.

* Make ShiftExistingBiomes available via API

makes the ShiftExistingBiomes function available to other mods via the nether global, since it's not a simple function and biomes would also need to be shifted if another mod wants to add a second nether layer.

* Allow layers to extend the depth of nether effects

Mods can set/lower nether.DEPTH_FLOOR_LAYERS when creating a layer under the nether. This allows multiple layer mods to know where their ceiling should start, and to be included in the effects which only happen in the nether.

* document nether API

More of a tentative interop guide than an API.
Use snake_case for API functions.

Update README.md

Handle large protected depths

Portals will now fail to ignite instead of defaulting to a fallback depth of (starty - 256) when no unprotected target can be found.
The search depth is also increased from (starty - 256) to (starty - 646)

This is to properly handle large protected areas that are sometimes set up at spawn - see issue #26

Retroactively tagging version 1.1