Release 0.2.0

• Slightly improve performance of grapheme cluster segmentation.
• Fixes grapheme cluster segmentation of multiple consecutive regional flags.
• Add access to Age property of a codepoint (giving information about at which Unicode version a codepoint was introduced).
• Add access to the assigned name of a codepoint.
• unicode-query: Now also prints name and age properties.
• CMake install target also installs header and library (not just tools).
• Reduce number of dependencies down to fmtlib and (for unit tests) Catch2.
• Enables libunicode to be found via CMake's find_package().
• Improved default installation directories on UNIX via GNUInstallDirs helper.