Revert "optimize memory of split_transform_flag and cbf"

This reverts commit 2c4c8777cfe07a2ac361a7b146a376c0b1c7234b.
Revert "Motion vector decoding - Merge mode for P frames included. Debug of the code is work in progress"

This reverts commit 011d9ca6e2b725cbac1923cd7a4bfc010c6ce8ee.