Resolve "Double precision arithmetic in MCT"

• Related issues: #812 (closed)
• Requested reviewers: @fotopoulou

Reason why this change is needed

Replace double precision log() and floor() by single precision equivalents.

Description of the change

Replace double precision log() and floor() by single precision equivalents.

Affected operating points

• Theoretically could affect all MCT operation points (i.e. determine the number of signaling bits dependent on number of TCs), but they are all BE.
  • Produced bitstream is BE compared to previous state.
  • Produced output is BE

Related to #812 (closed)