Feature: Adding support for custom @tags

One of the nice things with LDoc was the ability to define custom tags, so they could be used to give additional annotations.

As an example, this is the tags section of one of our projects.

custom_tags = {
	{"baseclass", title = "BaseClass", hidden = true},
	{"state", title = "State", hidden = true},

	{"warns", title = "Warnings", format = function(...)
		return "<span class='tag-warning'>" .. markup(...) .. "</span>"
	end},
	{"bugs", title = "Known Issues", format = function(...)
		return "<span class='tag-bugs'>" .. markup(...) .. "</span>"
	end},
	{"deprecated", title = "Deprecated", format = function(str)
		if str == "" then
			return "<span class='tag-deprecated'>This function is deprecated and may be removed in a future version.</span>"
		else
			return "<span class='tag-deprecated'>This function is deprecated and may be removed in a future version.<br>" .. markup(str) .. "</span>"
		end
	end},
	{"internal", title = "Internal", format = function(str)
		if str == "" then
			return "<span class='tag-internal'>This function is internal. Whilst you can call it, you probably shouldn't.</span>"
		else
			return "<span class='tag-internal'>This function is internal. Whilst you can call it, you probably shouldn't.<br>" .. markup(str) .. "</span>"
		end
	end}
}

Even if these aren't used internally, being able to define them for LuaLS to parse and export from the docs exporter in the json document would allow us to do post-processing on the files.

まずドキュメントエクスポーターと、それが生成する JSON ドキュメントを見つけ、次に Lua アノテーションがどのように解析・エクスポートされるかを追跡します。タイトル、hidden フラグ、format 関数を含む custom_tags エントリを、エクスポートされた JSON 内でどのように表現するかを定義します。custom tags を内部利用を必要とせずに解析して後処理できれば完了です。