+ defaultTile; + create_surface(); ^ music

added the map.defaultTile variable. it is the background tile of the map.
you can alt+left_click to set the defaultTile and alt+right_click to remove it.
added the create_surface() function. it will make a surface for you and return you a poitner to it.
fixed music. music fades when you leave mapmaker.

Signed-off-by: jensenr30 <jensenr30@gmail.com>
Merge branch 'master' of https://github.com/jensenr30/De_Flux