Release 0.6.0

  - CMake: Add ${CMAKE_BINARY_DIR}/src to target_include_directories().
  - debian/: Prepare release v0.6.0. Update packaging from Debian
    unstable.
  - tests/test-libappindicator-fallback-watcher.c: Increase test
    timeout, fix unit test on riscv64.
  - Add support for tooltips.
  - Add macros for compile-time version checking.
  - Use symlink in the build directory for includes.
  - Revert "Explicitly mark deprecated functions and use substitutes".
  - Implement the Activate D-Bus method for primary click handling.
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