Improved music handling system

Hi everybody! This is my first post to the list, so maybe I first introduce myself: Heikki Ketoharju, Finnish musician/nerd and occasional gamer. 22 years old, living in Helsinki now. I modified Lincity-NG so that it no longer plays one song looped, but plays all songs in the "music" directory. Moreover, I added some more flexibility to the code, to allow future development. Can someone please check if attached patch really compiles works right? At least for me it works nicely. What works for now: * Play all songs one after another (sorted alphabetically, I think) * Skip between songs easily with one command. (Not implemented in GUI) * All songs are nicely organized to the table of struct variables. Future plans: * XML configuration file in music folder * Different sound themes * Songs can be set to play only in certain tech-levels (halfway done I think) * Some kind of transport control buttons in game screen, to allow changing tracks ingame. * A whole new musical score for Lincity! I'm doing this in my spare time because I really like the game, but have got tired of "02 - City Blues.ogg" ;-) I'm not a very experienced (C++) coder, but I hope my patches are good enough :) When I get the code to admissible level, I will begin composing. I have few themes sketched already. Hopefully you like my idea about new music for the game? All comments and ideas conserning the future plans are welcome!