Add the FT v8 decoding

v7 is downgraded to "v5 treatment of large clusters", and the previous v7 is upgraded to v8.

Additionally, the following changes are implemented:

• removed type2 corrupt clusters, they stemmed from a wrong understanding of how v6 should be implemented
• a bug was found where clusters are not ordered by channel, which caused a crash. We are discussing with the firmware people to know where it could come from;