add container items to browse window (still messy)
changed window titles
moved client logic into nuvoapiclient. compiles, does handshake, not much else.
controls work, gui doesn't update
track metadata updates (no album art yet)
moved image downloading code, and tcp error code into nuvoapiclient class
client loads album art, signals GUI to reload displayed image
pretty much back to functionality before refactor. transport controls, metadata