minor correction to handling download delegate removal
changed constant literals to use constant labels. Not sure why this was changed in the first place as it didn't need to be.
modified pc and android impls to ensure new calls are made. These still have the same effective outcome (kill and start) until the equivalent is coded on these platforms to pause and resume the music.
fixed bug with iOS sound effects not playing. Forgot to assign the key to the associated music sample
* adjusted the touch sensitivity of the iOS port for deck menu selection. Decks were being selected even though the selection was touched. It was highlighted but as soon as you let go it would instantly select (OK button) select the selected deck. This isn't a problem on Android as the SDL already handles this as far as I can tell. I limited this to only iOS so I don't accidentally mess up the other ports.
Jailbroken devices have full access to the filesystem and don't have this restriction. although I do recommend that they do drop zip files into the Documents directory to reduce the risk of causing any undefined behavior with updating the config files while the game runs.
* Single Tap now implemented
* Touch and Hold (2 secs) to pop up menu
* added a pan gesture to simulate flicking up/down and left/right
* removed dependency on binding keys to game for iOS devices. (perhaps extend this to all touch devices.)
* flicking motion needs to be expanded to allow for smooth scrolling. Right now every flick is equivalent to going one slot up/down/left/right.
