Eclipse Expansion

## v0.5 - The Locus Eclipsis Update

### Dimension
- Added the Locus Eclipsis — a new custom dimension accessible through the Eclipse Portal
- The dimension features permanent eclipse sky rendering with custom sun texture
- Day/night cycle is active but the eclipse effect is always present
- The Valle del Eclipse biome now exists exclusively in the Locus Eclipsis

### Portal
- Added Sealed Threshold Rock — the frame block for the Eclipse Portal
- Added Eclipse Portal — activated by using a Corrupted Solar Fragment on a completed Sealed Threshold Rock frame (4x5)
- Portal automatically generates a return portal in the destination dimension
- Portal generates a Threshold Stone platform if no safe ground is found

### Entities
- Removed Glitch — this entity has been removed from the game
- Rednal now spawns exclusively in the Locus Eclipsis
- Errante del Eclipse now spawns exclusively in the Locus Eclipsis
- Muru continues to spawn in the Overworld during eclipses and in the Locus Eclipsis

### World Generation
- Added Santuario del Portal — a rare structure that generates in any Overworld biome containing a deactivated Eclipse Portal
- Eclipse Ore now generates visibly in the Locus Eclipsis between Y 30 and Y 80

### Lore
- Added 4 lore books ambient in the Locus Eclipsis:
  - Diario de un Errante
  - Guia del Locus Eclipsis
  - Investigacion: Locus Eclipsis
  - Los Preceptos del Eclipse
- Updated Codice del Umbral — now references the Locus Eclipsis