Updates to coincide with SDK 2.2.0. Includes minor improvements and bug fixes

Highlights are listed below, or you can see the full list of individual commits here, and the full list of resolved issues here.

New Features

• Added support for creating self-decrypting binaries to picotool encrypt
• Added support to picotool otp dump to dump to a BIN file, and also to dump from a JSON file - this allows conversion from an OTP JSON file to a BIN file with picotool otp dump otp.json --output otp.bin

Breaking Changes

• picotool encrypt now requires an IV Salt file to be passed in addition to the AES Key file

Notable Improvements

• Sped up the picotool info command further for unhashed/unsigned binaries
• Sped up picotool save, picotool verify and picotool load
• README.md has been rearranged with a separate BUILDING.md file
• picotool now plugs alignment holes in signed/encrypted binaries, to prevent failures when performing signature checks/decryption on uninitialised memory

Authors

Thanks to the following for their contributions:

Alexey Vazhnov, Andrew Scheller, Armando Montanez, Graham Sanderson, Hector Dearman, jan200101, Julian Mitchell, William Vinnicombe