feat: custom cursor

[xiaoxustudio]

issue: #975

支持：.ani，.cur，png,svg等格式文件

Custom_Corsur:<路径>[,类型,x,y];

具体类型在https://developer.mozilla.org/zh-CN/docs/Web/CSS/Reference/Properties/cursor

各个属性使用英文逗号分割。同时也同样支持设置多个鼠标状态，使用空格分割即可

注意：
当使用ani文件时，xy值将当作宽高处理（即ani文件无法设置热点位置）

预览：

[gemini-code-assist]

Code Review

This pull request adds support for custom cursors via the Custom_Corsur command, introducing the ani-cursor.js dependency to handle .ani files. Feedback on the implementation identifies a path resolution bug where the /game/ prefix is omitted for non-.ani cursors, a potential CSS injection vulnerability due to inserting unescaped values into a <style> element's innerHTML, and missing safety checks for parseInt results. A secure, refactored implementation is suggested to resolve these issues.

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[xiaoxustudio]

目前使用的是ani-cursor.js库，但原库似乎存在很多问题，如类型、不支持设置自定义热点坐标，查看原作者是否还在维护项目，如果没有维护可能会考虑fork原库后单独维护

[xiaoxustudio]

目前还有些特性未实现，考虑是否可以实现，如果无法实现，则放弃并保留基础自定义功能