Release 1.8.2

Backports

• Add missing headers
• Cherry picks
  • examples/mir_demo_server/server_example_input_filter.cpp: Typo in stdout.
  • Instantiate parameterized test suite DisplayOrientationSetting
  • Fix FTBFS.
  • Fix missing #includes for GCC 11
  • Fix FTBFS
  • Fix compiler errors
  • Delete obsolete gmock hack
  • Add missing include