Finally got precompiled headers to work.

Now all C++ files need to #include <util/prec.hpp>
 That is why all .cpp files are touched by this commit

Many changes to installers and update checking:
     - the window is now called PackagesWindow, in a new source file
     - update checking is now independent from the PackagesWindow. For update checking only a list of package versions are needed (vector<PackageDependency>). This is much less information to download at each startup.
     - the list of available packages is now a list of available Installers, since an installer can contain multiple packages.
     - moved the logic of dependency checking etc. to data/installer
     - moved the actual installation to util/io/package_manager
     - moved directory iteration/creation logic to util/file_utils
     - added PackageDirectory: the local and global package directory now have their own object (was part of PackageManager)
     - added PackageVersion: for detecting if a package has been modified after it was installed.
     - added PackageDescription: description/header of a package. Basicly the same as what Packaged provides.
     - added DownloadableInstaller: where to find an insaller, what does it contain?
     - added InstallablePackage: brining it all together: installer, package, status, action.

Current status: the insaller is currently broken in a few places, more on that soon.

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@792 0fc631ac-6414-0410-93d0-97cfa31319b6

src/util/file_utils.hpp

@@ -0,0 +1,44 @@
+//+----------------------------------------------------------------------------+
+//| Description:  Magic Set Editor - Program to make Magic (tm) cards          |
+//| Copyright:    (C) 2001 - 2007 Twan van Laarhoven                           |
+//| License:      GNU General Public License 2 or later (see file COPYING)     |
+//+----------------------------------------------------------------------------+
+
+#ifndef HEADER_UTIL_FILE_UTILS
+#define HEADER_UTIL_FILE_UTILS
+
+// ----------------------------------------------------------------------------- : Includes
+
+#include <util/prec.hpp>
+
+// ----------------------------------------------------------------------------- : File names
+
+/// Normalize a filename as much as possible, for real files
+String normalize_filename(const String& filename);
+
+/// Normalize a filename as much as possible, for files in packages
+String normalize_internal_filename(const String& filename);
+
+/// Should a file with the given name be ignored?
+bool ignore_file(const String& name);
+
+// ----------------------------------------------------------------------------- : Removing and renaming
+
+/// Ensure that the parent directories of the given filename exist
+bool create_parent_dirs(const String& file);
+
+/// Remove the given file or directory
+/** It is not an error if the file doesn't exist.
+ *  Removes all files in a directory.
+ *  Returns true if something was removed
+ */
+bool remove_file_or_dir(const String& file);
+
+/// Rename a file or directory
+bool rename_file_or_dir(const String& old_name, const String& new_name);
+
+/// Move files/dirs that are ignored by packages to another directory
+void move_ignored_files(const String& from_dir, const String& to_dir);
+
+// ----------------------------------------------------------------------------- : EOF
+#endif