Complete refactor of project file structure

Fix incorrect handing of default node parameters in SSD subscription.
Fix unable to parse some Clash rule-providers (#289).
Fix not filtering inline comments in some Surge rulesets. (#285)
Add Cron task options.
Add clean context option for persisting a JS context across the whole request.
Replace JS engine with QuickJS.

base/pref.example.yml

@@ -123,6 +123,12 @@ aliases:
   - {uri: /v2ray, target: "/sub?target=v2ray"}
   - {uri: /trojan, target: "/sub?target=trojan"}
 
+tasks:
+#  - name: tick
+#    cronexp: "0/10 * * * * ?"
+#    path: tick.js
+#    timeout: 3
+
 server:
   listen: 0.0.0.0
   port: 25500