[refactor] do some works

- move gitignore in individual directories.
- change some directory layout.
- refactor NlpCodec but not finished.

NlpParser/assets/testbench.txt

@@ -0,0 +1,61 @@
+Language:English
+
+/*
+long comments
+*/
+
+// short comments
+
+[Layout 0]
+
+"entry 0"
+
+<layout 0 0>
+"Virtools Dev1","Virtools Dev2"
+"Virtools Dev3"
+"Virtools Dev1","Virtools Dev2",
+"Virtools Dev3"
+
+<layout 0 1>
+"Virtools Dev"
+
+[Layout 1]
+
+<layout 1 0>
+<layout 1 1>
+
+[String Escape]
+
+<String Escape 0>
+
+"foo bar"
+"\\foo\tbar\n"
+"foo	barr	"
+"\\""foo""\t""bar"""
+
+<String Escape 1>
+
+"foo"\      // short comments
+"bar"
+
+"foo\       // short comments
+bar"
+
+"foo"\      // short comments
+"bar"\      // short comments
+"bar"
+
+"foo\       // short comments
+bar\        // short comments
+bar"
+
+<String Escape 2>
+
+"foo""\\"\
+"""bar"
+
+"foo""\\\
+""bar"
+
+"foo\n\
+bar"