enhance the progress thread update

- limit refresh interval to 200 msec for nandroid operations
- keep the progress background icon overlay updating for normal and
  indeterminate progress
- no more need to increment background icon overlay frames by caller

Change-Id: I643e30505f962ebbf67aae57baa06a296006e542
Refresh nandroid progress without on-screen text

* Remove display of files to ui - this was severely slowing backups
* Remove ui_nice functions since they are no longer used

Change-Id: Iaa8b6bc3989752016b296e6f087c64fc216e5f00