dpb: does not need to include frameencoder.h
search: remove x prefixes from ME helper functions
analysis: minor comment and code cleanups, no behavior change
api: add analysis data structures and param options
api: introduce methods to allocate and free analysis buffers
store analysis information in buffers
cli: add cli options analysis-mode and analysis-file

analysis-mode: save|1 - Dump analysis buffers into file, load|2 - read analysis buffers from the file
analysis-file: Specify file name used for either dumping or reading analysis data