[zeshan321]

What changes

• Show On Look checks the whole hitbox (1.13.2+). ActionHealth ray traces each nearby entity's hitbox. Large mobs and ModelEngine models now show health when the player looks at their body. Before, the check measured the view line against the entity's feet only. The old check still runs, so nothing that matched before stops matching.
• Nearest entity first. Show On Look sorts targets by distance.
• Fix: possible server freeze. getTarget returns at a distance of 0. BlockIterator treats 0 as no limit, so a player at an entity's exact position made the check walk the view line and load chunks. The new hitbox check made this case more likely, and the ModelEngine test found it.
• README rewrite. Supported versions, features, install, commands, placeholders, optional plugins and building.
• Version 3.7.1.

Why no ModelEngine code

I tested with the free Legacy Model Engine Demo (R3.1.11) on Spigot 1.20.4:

• ModelEngine hides the real mob with packets. It adds no invisibility effect, so Invisible Potion does not affect models.
• ModelEngine resizes the real mob's server-side hitbox to fit the model (checked with volume selectors). The Bukkit hitbox API sees the model's size.
• Hits on the model's hitbox entity reach the real mob. 3.7.0 already showed health on hit.

ModelEngine R4 has no free version, so it was not tested.

Tests

• New MODE=modelengine e2e check. It runs in integrations.sh when a ModelEngine-*.jar is in compat/.cache/plugins. 3.7.0 fails the two checks that look up at the body. 3.7.1 passes all 5.
• Spigot matrix, 27 versions from 1.8 to 26.3: pass.
• Paper 1.8.8, 1.20.6, 1.21.11, 26.3, WorldGuard 6.1, 6.2.2, 7.0.15, 7.0.19, PlaceholderAPI on 1.8.8 and 26.3: pass.
• Linkage check, 68 spigot-api versions: pass.

Closes #44.

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