DC: refactor freezer to an app manager

allows to clear cache, data, kill the app, disable the app.
also shows information about the current sizes of the app, like
app, obb, media, cache, data etc.

the included aidl files are only for the non AOSP tree version, as if
used in an AOSP tree, it will crash proguard

Change-Id: I5473c4cd55f264f691d2ec8f714fc23b238ae80b