prerectime, prefix

prelim testing passes for potato
- prefix is currently write-only, so added as a method like FileType

lib/recorder.ps1

@@ -19,7 +19,10 @@ class Recorder : IRemote {
         }
 
         AddActionMembers -PARAMS @('play', 'stop', 'pause', 'replay', 'record', 'ff', 'rew')
+        
         AddFloatMembers -PARAMS @('gain')
+        AddIntMembers -PARAMS @('prerectime')
+
         AddChannelMembers
     }
 
@@ -147,6 +150,10 @@ class Recorder : IRemote {
         }
         $this.Setter('filetype', $val)
     }
+
+    [void] Prefix ([string]$prefix) {
+        $this.Setter('prefix', $prefix)
+    }
 }
 
 class RecorderMode : IRemote {