[tpm2] [RELEASE CANDIDATE] tpm2-tss-engine 1.2.0-rc0

Hi everyone,

I just tagged tpm2-tss-engine 1.2.0-rc0 that can be found here: https://github.com/tpm2-software/tpm2-tss-engine/releases/tag/1.2.0-rc0

NOTE: I changed the tag-scheme from v1.1.0 to 1.2.0 (i.e. removed the leading v) in order to use "git describe" during configure.ac
If this breaks anything for you badly, please get in touch.

For convenience, here's the changelog:
### Changed or Fixed
- Updated minimal version of tpm2-tss to 2.4.x
- Fix encoding of emptyauth
- Fix some memory leaks
- Change parent handle to BIGNUM

### Added
- Use of restricted keys for signing
- StirRandom
- Run tests using swtpm
- The ability to import key blobs from things like the tpm2-tools project.
- Compatibility with openssl >=1.1.x
- Support for ECDH
- Fix QNX build issues.
- Only set -Werror for non-release builds.
- Additional checks on TPM responses
- CODE_OF_CONDUCT

Best regards,
Andreas