Realistic Tectonics

# Realistic Tectonics 0.1.1

Same features on NeoForge 1.21.1 and Fabric 26.2.

## New landforms
- **Fjords**: on cold coasts, glacial valleys are flooded by the sea. They are deep U-shaped troughs with steep rock walls and a shallow sill at the mouth, and glaciers end in ice cliffs at the water.
- **Tablelands**: uplifted layers of sedimentary rock step down in benches and cliffs, with mesas and buttes. A new **Cliff height** slider (8-48 blocks, default 24) sets how tall each cliff is.
- **Horsts and grabens**: behind ocean trenches the land stretches into flat-topped raised blocks and sunken basins with stepped fault scarps.
- **Gorges**: steep rivers on wet limestone and marble uplands cut gorges with wooded, craggy walls.
- **Calm plains**: high plains on old continental cores are only as hilly as their river valleys are deep. They no longer get mountain-style hills.

## New options
- **Earth: Start in**: choose where you spawn on the Earth world: Europe (the default), North America, South America, Africa, Asia, Australia or anywhere. In Europe, X follows real longitude.
- **Continents: Medium-sized**: Large and Huge planets get more Medium-sized continents instead of a few giant ones. Huge planets also need less memory now.

## Map and commands
- **Live plates**: the planet screen shows the plates drifting while the planet simulates.
- **Map layers (M)**: press G to cycle the biome, geology, plates (with motion arrows), rain and temperature maps. Press R to replay the plates drifting over the planet's history.
- **`/tectonic`**: tells you what the planet says about where you stand: the rock, your plate and its speed, the nearest plate boundary and its type, and the nearest volcano and glacier.

## Fixes
- No more round, sheer-walled sea-level pits on volcanoes. Atolls now form only where the land has really sunk under the sea.
- Calderas are no deeper than 1,200 m below their rim.
- Lake outlets open into their rivers instead of being walled off.
- No more cut-off stone pillars in caves that are open to the sky.

## Compatibility
- Worlds made with 0.1.0 load and keep their look. The new terrain appears in new worlds only, so there are no seams in old ones.
- Fabric: needs Fabric API and Java 25.