- Create projects based on templates.
- removed some unused code
- added a multi project template without example code
- added a multi project GWT project template with the example code from
the existing GWT sample project, but splitted into 3 projects.

- javaProjects as List instead of Array
- Copyright information updated / inserted
- Fixed multithreading bug
- removed xsiframe from gwt.xml file
- replaced mkdirs() with Files.createDirectories()
- Use UTF-8 instead of defaultCharset
-Use Files.writeString() instead of BufferedWriter

- all renaming of files is done  by using the same method.
- allow filenames to contain the placeholder _PROJECTNAME_