Release of v0.6.0

version 0.6.0:

• swtpm:
  • Fix --print-capabilities for 'swtpm chardev'
  • Various cleanups and fixes (coverity)
  • Addressed potential symlink attack issue (CVE-2020-28407)
• swtpm_setup:
  • Rewritten in 'C'; needs json-glib
  • Addressed potential symlink attack issue (CVE-2020-28407)
• swtpm_ioctl:
  • Use timeouts for communicating with swtpm (Unix socket)
• swtpm-localca:
  • Rewritten in 'C'
• tests:
  • Use the IBM TSS2 v1.6.0's test suite
  • Store and also restore the volatile state at every step when running
    IBM TSS2 test suite
  • Various cleanup
• build-sys:
  • Add HARDENING_CFLAGS and _LDFLAGS to all C programs