ui: show progress bars in shows list

they are ugly. need to be made prettier
ui: make progress bars look prettier

will use device's chosen theme. looks good in holo. still looks
rubbish when not holo
remove now unused variables
ui: show progress in seasons list
ui: use custom style for show/season watched progress bars

plain blue rectangle on grey background.
colour codes taken directly from holo theme.
ui: align watched progress bars to bottom of listitems