SPIFlash

Please report any bugs in issues.

Change log

When #RUNDIAGNOSTIC is uncommented, the _troubleshoot() function is now optimised for different µCs
Added the ability to check if the address has been previously written to before initiating a write
operation.
Added a sizeofStr() function to get sizes of String objects, to use with the getAddress() function
Fixed a bug with getAddress()
Added the ability get the chip's name via getChipName()
Diagnostics.ino has been made more and efficient and provides a cleaner Serial output
Added getAddressEx.ino to show how getAdress() works.