[功能请求] 掉落物编辑器 | Drop.json Editor

[jie65535]

https://github.com/Grasscutters/Grasscutter/discussions/1801

增加一个对怪物掉落物进行编辑的功能，它在GC的 Drop.json 中定义。

要求可以多选编辑和重置，导入导出等。

[jie65535]

@FISHandCHEAP For a drop editor, now the problem is, there are multiple IDs for the same monster, I think it's because some monsters in plots or quests will not drop anything, while they will in the bigworld. So I suggest that, your drop editor need to separate regular monsters from all monsters.

Here's my idea: suppose there are 4 Monster IDs for a Hilichurl, your editor needs to tell users which ID is for the Hilichurl in the BigWorld, and suggest them to not add anything to the drop list of other 3 IDs.

[jie65535]

Done!