QP_SWITCHING_FOR_PARALLEL (for the two old macros JVET_E0059_FLOATING_POINT_QP_FIX and JVET_G0101_QP_SWITCHING in JEM)

Use steady clock instead of high-precision one to guarantee monotonicity

planar mode with shifts

Fix a typo in fastInverseDCT2_B128 (TRANSFORM_FORWARD instead of TRANSFORM_INVERSE). No performance change.

- correct some defines for combinations of options
- fix some more compiler warnings