Add support for importing snippets

Clean up file structure.

base/snippets/rulesets.txt

@@ -0,0 +1,15 @@
+🎯 全球直连,rules/LocalAreaNetwork.list
+Ⓜ️ 微软服务,rules/MSServices.list
+🎯 全球直连,rules/ConnersHua/Surge/Ruleset/Unbreak.list
+🛑 全球拦截,rules/NobyDa/Surge/AdRule.list
+🛑 全球拦截,rules/ConnersHua/Surge/Ruleset/Hijacking.list
+;🎥 NETFLIX,rules/ConnersHua/Surge/Ruleset/Media/Netflix.list
+🌍 国外媒体,rules/ConnersHua/Surge/Ruleset/GlobalMedia.list
+🌏 国内媒体,rules/lhie1/Surge/Surge 3/Provider/AsianTV.list
+📲 电报信息,rules/ConnersHua/Surge/Ruleset/Telegram.list
+🔰 节点选择,rules/ConnersHua/Surge/Ruleset/Global.list
+🍎 苹果服务,rules/ConnersHua/Surge/Ruleset/Apple.list
+🎯 全球直连,rules/ConnersHua/Surge/Ruleset/China.list
+🎯 全球直连,rules/NobyDa/Surge/Download.list
+🎯 全球直连,[]GEOIP,CN
+🐟 漏网之鱼,[]FINAL