Update projectfiles and corresponding readme

- Add the new files introduced by gfgtdf to the VC project.
- Fix the indentation of SConscript.
- Update the README files for Code Blocks and Visual Studio.
Merge pull request #139 from aquileia/VC_project_update

Update project files
Wrap some directory composition in get_dir
Merge branch 'master' of github.com:wesnoth/wesnoth