Bugfix blockSize (Spansion chip, model with 256K sector size)

The Spansion cards can have 64Kb or 256Kb depending on the model's
number. The device id[4] must be checked to determine the sector
architecture.

https://forum.pjrc.com/threads/27409-Play-RAW-from-Serial-Flash?p=91876&viewfull=1#post91876

Create library.json

Bugfix Capacity (important)

Return true on successful write

perhaps better

Shift was wrong direction