add parent folder textbox.
Use consistent name for directory
merge all ui building functions to one file (entasy_ui.c)
make all ui creation functions void and move callbacks to main.
make play/stop/prev/next buttons work. Also remove some errors
fix nullcover.jpg postion and remove printf.
fix prev/next when destination is a folder.
Parent folder, directories open when clicked and warn fix

 - add ".." in list to use it to go up on directory (not yet implemented)
 - directory opens when you click on it
 - fix a warning about snprintf
 - add gstreamer1 as default emotion engine (it will fallback to whatever it finds, by default)