Update decode_details for 0.8.6 / 0.8.7, + decode_crits

- Format changed for details: damageAssisted splitted to damageAssistedTrack damageAssistedRadio, killed -> deathReason, crits is now uint
- Create decode_crits to decode the crits introduced in 0.8.6

Cleanup should be done regarding decode_details and decode_details_LEGACY to handle older replays correctly.