Allow enabling dev logs

This patch allows users to enable dev logs on production systems by
setting the `HIDE_DEV_LOGS` environment variable.

Before, you could only use this on a non-production environment. On
production, the logs would be disabled. This patch changes the behavior
and uses the `NODE_ENV` only as default. On production they are disabled
if `HIDE_DEV_LOGS` is undefined but can be enabled by setting
`HIDE_DEV_LOGS=0` on dev, they are enabled if undefined, but can be
disabled by setting `HIDE_DEV_LOGS=1`.

server/Logger.js

@@ -5,6 +5,7 @@ class Logger {
   constructor() {
     this.isDev = process.env.NODE_ENV !== 'production'
     this.logLevel = !this.isDev ? LogLevel.INFO : LogLevel.TRACE
+    this.hideDevLogs = process.env.HIDE_DEV_LOGS === undefined ? !this.isDev : process.env.HIDE_DEV_LOGS === '1'
     this.socketListeners = []
 
     this.logManager = null
@@ -92,7 +93,7 @@ class Logger {
    * @param  {...any} args
    */
   dev(...args) {
-    if (!this.isDev || process.env.HIDE_DEV_LOGS === '1') return
+    if (this.hideDevLogs) return
     console.log(`[${this.timestamp}] DEV:`, ...args)
   }