Fix recursive Ctags output

Previously using `dscanner --ctags -R <dir>` would output tags without
any filenames, making it pretty useless for navigating in a project.
This was due to all the syntax objects being merged into a single generic
Module, then outputting that module without a filename specified.

This fix does the following:
 * Moves the CTag header output from the Module class to the proper spot in
    main.d
 * Renames `Module.writeCtagsTo` to `getCtags` and now returns string[]
    with the prepared tag lines.
 * The CTag printing functionality in main.d now gathers all tag lines
    from each module, sorts, then outputs.

Note that a more optimal implementation would be fairly straightforward.
Instead of simply returning a string[], `Module.toCtags` could take a
sorted container and insert in sorted order.  main.d could pass this
container to each module in turn, then output the results.

main.d

@@ -258,30 +258,32 @@ int main(string[] args)
 
 	if (ctags)
 	{
+		stdout.writeln("!_TAG_FILE_FORMAT 2");
+		stdout.writeln("!_TAG_FILE_SORTED 1");
+		stdout.writeln("!_TAG_PROGRAM_URL https://github.com/Hackerpilot/Dscanner/");
 		if (!recursiveCtags)
 		{
 			auto tokens = tokenize(readText(args[1]));
 			auto mod = parseModule(tokens);
-			mod.writeCtagsTo(stdout, args[1]);
+			//mod.writeCtagsTo(stdout, args[1]);
+			foreach (tag; mod.getCtags(args[1]))
+				stdout.writeln(tag);
 		}
 		else
 		{
-			Module m;
+			string[] allTags;
 			foreach (dirEntry; dirEntries(args[1], SpanMode.breadth))
 			{
 				if (!dirEntry.name.endsWith(".d", ".di"))
 					continue;
 				stderr.writeln("Generating tags for ", dirEntry.name);
 				auto tokens = tokenize(readText(dirEntry.name));
-				if (m is null)
-					m = parseModule(tokens);
-				else
-				{
-					auto mod = parseModule(tokens);
-					m.merge(mod);
-				}
+				auto mod = parseModule(tokens);
+				allTags ~= mod.getCtags(dirEntry.name);
 			}
-			m.writeCtagsTo(stdout, "");
+			allTags.sort();
+			foreach (tag; allTags)
+				stdout.writeln(tag);
 		}
 	}
 	return 0;

types.d

@@ -559,7 +559,7 @@ public:
 	/**
 	 * Standards: http://ctags.sourceforge.net/FORMAT
 	 */
-	void writeCtagsTo(File file, string fileName)
+	string[] getCtags(string fileName)
 	{
 		string[] tags;
 		foreach (Enum e; enums)
@@ -589,15 +589,7 @@ public:
 		{
 			tags ~= s.getCtags(fileName);
 		}
-
-		sort(tags);
-		file.writeln("!_TAG_FILE_FORMAT 2");
-		file.writeln("!_TAG_FILE_SORTED 1");
-		file.writeln("!_TAG_PROGRAM_URL https://github.com/Hackerpilot/Dscanner/");
-		foreach (tag; tags)
-		{
-			file.writeln(tag);
-		}
+		return tags;
 	}
 }