Full plugins and server redesign

- Languages, issues and pr are now plugins (but enabled by default for retro-compatibility)
- Query parameters are now parsed correctly
- Redesigned server index with vue.js

src/metrics.mjs

@@ -11,6 +11,8 @@
       try {
 
         //Init
+          console.debug(`metrics/compute/${login} > start`)
+          console.debug(JSON.stringify(q))
           const template = q.template || conf.settings.templates.default
           const pending = []
           const s = (value, end = "") => value > 1 ? {y:"ies", "":"s"}[end] : end