tpm2_unseal: Add qualifier static to enhance the privacy of unseal function

tpm2_sign:

• Remove -m option which was added mistakenly
• Revert sm2 sign and verifysignature

tpm2_createek: - Correct man page example

• Fix usage of nonce
• Fix integrating nonce

tpm2_clear: add more details about the action

tpm2_startauthsession: allow the file attribute for policy authorization.

tpm2_getekcertificate: Add AMD EK support

tpm2_ecdhzgen: Add public-key parameter

tpm2_nvreadpublic: Prevent free of unallocated pointers on failure

Bug-fixes:

• The readthedocs build failed with module 'jinja2' has no attribute 'contextfilter' a requirement file was added to fix this problem

• An error caused by the flags -flto -_FORTIFY_SOURCE=3 in kdfa implementation. This error can be avoided by switching off the optimization with pragma

• Changed wrong function name of "Esys_Load" to "Esys_Load"

• Function names beginning with Esys_ are wrongly written as Eys_

• Reading and writing a serialized persistent ESYS_TR handles

• cirrus-ci update image-family to freebsd-13-2 from 13-1

misc:

• Change the default Python version to Python3 in the helper's code

• Skip test which uses the sign operator for comparison in abrmd_policynv.sh

• tools/tr_encode: Add a tool that can encode serialized ESYS_TR for persistent handles from the TPM2B_PUBLIC and the raw persistent TPM2_HANDLE

• Add safe directory in config