Adds a modern OS X interface for the rogue-like game, Hengband ( https://hengband.github.io ).
There's been no change to the save file structure or system requirements from 1.6.2b to 1.6.2c. The executable was compiled on macOS 11.5.1 rather than 10.15.7 , but that should not affect compatibility with systems running macOS 10.15 or earlier.
Fix bug that a font, specified in the preferences but no longer available on the system, would cause the application to hang.
In the display, round the median advance down, rather than up, for a more compact horizontal layout with some fonts. Change the default window layout to better match the default font settings and to accommodate the smallest native screen size for currently supported Retina Macs (2304 x 1440).
Make minor changes to the English descriptions for Robin Hood and unruly horses.
Reduce the overhead on Macs related to checking for window flag changes.
Clean up the Mac-specific code a bit for more consistent handling of Booleans, fewer compiler warnings, and to better match up with what's in Angband's version of the Mac front end.
Change the build system to avoid warnings with recent versions of autoconf, avoid clang compiler warnings about not recognizing "-fno-strength-reduce", and to be more consistent with the distclean and uninstall rules.
The executable was compiled on macOS 11.5.1 rather than 10.15.7. If you encounter problems with versions of macOS prior to 11.5.1, please let me know.
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