Add skeleton/plan for LCU based search.
Add skeleton/plan for LCU based search.

The plan is to replace the dumb search we are doing now with proper sequential
search that is encapsulated inside data structure that holds all temporary
search data for the LCU.

ultravideo/kvazaar,lu-zero/kvazaar,ultravideo/kvazaar,lu-zero/kvazaar,lu-zero/kvazaar,lu-zero/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar