Remove TextFile from public API

doc/classes/TextFile.xml

@@ -1,13 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" ?>
-<class name="TextFile" inherits="Resource" version="4.0">
-	<brief_description>
-	</brief_description>
-	<description>
-	</description>
-	<tutorials>
-	</tutorials>
-	<methods>
-	</methods>
-	<constants>
-	</constants>
-</class>

scene/resources/text_file.h

@@ -36,8 +36,6 @@
 
 class TextFile : public Resource {
 
-	GDCLASS(TextFile, Resource);
-
 private:
 	String text;
 	String path;