Cache usage percent

[SenorSmartyPants]

Could you please add info to display how much of the on device cache is currently being used. I like to permanently cache lots of things and would like to see how much of the cache I have used up. It would help me figure out if I need to bump up the cache amount.

Having a distinction between permanently cached songs and regularly cached ones would be ideal.

2000MB cache size
75% (1500MB) permanently cached
10% (200MB) cached
15% available

something to that effect.

[daneren2005]

Permanent cached songs are not used against the cache limit. I will add it to the TODO list to add a line item with how much is permanently cached as well.