Update relast-preprocessor to newest version.

• remove mustache (reuse the submodule of the preprocessor)
• align attributes and build logic to changes in preprocessor

Closes #27 (closed)

ragconnect.base/src/main/jastadd/intermediate2mustache/MustacheNodesToYAML.jrag

@@ -206,5 +206,5 @@ aspect Navigation {
   eq Document.getChild().program() = null;
   eq Document.getChild().ragconnect() = null;
   eq Document.getChild().containedFile() = null;
-  eq Document.getChild().containedFileName() = getFileName();
+  eq Document.containedFileName() = getFileName();
 }