remove deprecated IMV mode SPS parameter
AMVR (formely IMV) now has only one mode, which used to be mode 2
- remove SPS imv_mode parameter
- remove encoder configuration for mode 1 (mode 2 replaces mode 1)
- adapt config files to refer to mode 1
- rename SPS syntax elements and access functions to AMVR
Note: IMV to AMVR renaming in other parts of the software should be done by proponents.
No change except for SPS bits.
Edited by Karsten Suehring