Code Cleanup: Remove files that aren't needed.
Add vague icons for mtpc.

These icons aren't good enough. But will work as a place-holder for now.
Need to fix them later.
mtp_device.[hc]:  Cover methods for libmtp.
utils.[hc]: utility functions for mtpc
window.[ch]: Main window ui routines.

This file has methods that will create and manage the gtk+ ui.
Modified devicelist gtktreeview.
main.c: Use the new set of routines.