Develop histogram logging

Add date to WriteToFile filenames and simplify
file format. Add timestamp logging to
NormalMixer. Change histogram resolution
dynamically based on logarithmic distance
from the distribution center. Add context
information: thread, hash and time.

Example of right end of a histogram with
rounding for values >= 27:

   1    1    2    1    1    1    2    2    1

             |                   |    |
   |    |    |    |    |    |    |    |    |
_____________________________________________
21.1 21.2 22.9 23.0 23.3 27.0 34.0 37.0 38.0   ms

Test: dumpsys media.log

Change-Id: I255e2d28d76a1c7a06d48e7c3eacdf2f846a7ea3