Released AIXF: Per-Forum Maximum Message Length 2.3.7

# AIXF: Per-Forum Maximum Message Length

This XenForo add-on allows you to configure **different maximum message lengths per forum node**.
It enforces limits when users create threads, post replies, or edit messages.

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## How it works
- A **global maximum** is defined in **ACP → Options → Messages → Maximum message length**.
- Each forum node has a field under **Advanced options → Per-forum maximum message length**.
- When set to `0`, the forum inherits the global maximum.
- When set to a number greater than `0`, that number overrides the global maximum for that forum.

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## Important setup notes
- **Do not set the global maximum to something extreme like 50,000 unless you want every forum to allow it.**
- Raising the global applies site-wide.
- This can lead to performance and moderation issues.
- The recommended baseline is **10,000** characters for most forums.
- If you need one or more forums with a higher cap:
1. Set the **global maximum** to the high number you want (e.g., 50,000).
2. For every other forum, go to **ACP → Forums → Nodes → Edit forum → Advanced options** and set **Per-forum maximum message length** to a lower value (e.g., 10,000).
3. Leave the special forum(s) at `0` (inherit global) or explicitly set them to the higher value.

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## Example setup
- Global maximum: **50,000**
- Special forum: leave at `0` (inherits 50,000)
- All other forums: set per-forum maximum to **10,000**

Result:
- Special forum allows posts up to 50,000 characters.
- All other forums are capped at 10,000 characters.

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## Why not just raise global for everyone?
- Large posts everywhere can impact database size, search indexing, and moderation workload.
- Most forums do not need more than 10,000 characters.
- Use per-forum overrides to keep posting reasonable while allowing long-form content where needed.