Completing entities in Glowstone

Entities are an essential component of Minecraft, and their functionality is not yet complete in Glowstone. This _Story_ was created to track remaining issues and missing functionality. I rewrote it to keep it up to date considering the recent changes in entity physics. The original content of this Story can be found [here](https://pastebin.com/zHPKRTec).

Anyone can participate in the completion of this issue, which will be a major turning point in the development and the possible use-cases for Glowstone as a Minecraft server alternative.

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**Before getting started!** If you are unfamiliar with Glowstone, please remember that Glowstone is a complete _rewrite_ of the Minecraft vanilla server, aimed to be a better alternative to other software like Spigot. You are by no means allowed to push code to this repository based on Mojang's own platform (whether it be Forge, MCP, decompiled binaries, etc.) Doing so will cause in the rejection of your Pull Request. You are allowed to use other resources like the numerous wikis that exist on the Internet (Minecraft Wiki, wiki.vg, etc.) as well as trial-and-error.

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Please see the following issues for each part of this story.

- [ ] [](https://www.bountysource.com/issues/46548044-396-entities-physics) [Physics (#501)](https://github.com/GlowstoneMC/Glowstone/issues/501)
- [ ] [](https://www.bountysource.com/issues/46548045-396-entities-ai) [AI (#502)](https://github.com/GlowstoneMC/Glowstone/issues/502)
- [ ] [](https://www.bountysource.com/issues/46548046-396-entities-pathfinding) [Pathfinding (#503)](https://github.com/GlowstoneMC/Glowstone/issues/503)
- [x] [](https://www.bountysource.com/issues/46548049-396-entities-implementation) [Implementation of individual entities (#504)](https://github.com/GlowstoneMC/Glowstone/issues/504)
- [ ] [](https://www.bountysource.com/issues/46548051-396-entities-projectiles) [Projectiles (#505)](https://github.com/GlowstoneMC/Glowstone/issues/505)

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Start by reading the linked sub-issues #501 Physics, #502 AI, #503 Pathfinding, #504 individual entity implementation, and #505 Projectiles. The story is complete when the remaining unchecked entity areas have been addressed, but it does not identify a file, entry point, or focused first task.

Written by the indexing model from the issue text.