First step for compatibility layer

[ghost]

This loads a pseudo plugin called "Permissions" so a separate bridge plugin is not needed. Feel free to rename classes.

Code for reading permissions of offline players and players on different worlds still needs to be written. Also all the group/prefix/suffix stuff is missing.

[codename-B]

Hey Zeerix - don't worry about players on different worlds, my code handles that (it loads the corresponding permissions per world for the players automatically)