More textboxes

@Petsnew We need to pick a chapter on which we will beta-test this feature. Which chapter is your DLL for? Also is it merged with our latest DLL? Can you create a branch in the dlls repo with your changes?

As for configuration, @idealpersona implemented it in https://github.com/07th-mod/higurashi-dlls/issues/19 though I'm unsure if it is everywhere and ready to base new features on it. Let's wait for his feedback.

Next, do you intend to support https://github.com/07th-mod/higurashi-patch-compiler/issues/35 as well or not?

Which key is the user supposed to press to change a textbox?

FInally we'll need some textboxes to test this feature. Do you have something simple? Or should we ask @Grelo to create something?

该议题讨论了添加文本框功能，引用了 DLL 章节、来自议题 #19 的配置以及对议题 #35 的支持。首先检查链接的议题和 dlls 仓库以了解当前架构。确定触发文本框更改的按键以及需要哪些简单的测试文本框。这项工作涉及与多位贡献者的协调和范围不明确。

由索引模型根据 Issue 内容生成。