Mob Album: Bestiary & Mob Collection

Mob Album 0.4.1 - asked for in the comments: configurable detection range, line of sight, and an observe mode (spyglass or interaction), like Field Guide does.

• Closer by default: a mob now has to be within 16 blocks (was 32) to become a sticker, and the rare-sight alert reaches 32 blocks (was 64).
• Line of sight: only mobs you can actually see count. A cow behind a wall or in the cave under your feet no longer does. Glass and water do not block the view.
• Observe mode (/mobalbum config mode observe): nothing counts just by being near. Look at a mob through a spyglass (up to 64 blocks) or click it (hit or use) to collect it. Rare sights still chime, point the way and glow, but their gold sticker only comes when you observe them.
• Settings in config/vitral_album-client.json or in game with /mobalbum config: range (4-64), rareRange (4-64), lineOfSight true/false, mode nearby/observe, spyglassRange (8-128), reset.
• Your album is untouched: every sticker you already have stays.

Client-side only, as before. Thanks for the suggestion!