Cleanups for 23.2

[Myoldmopar]

Things found during IO freeze and bug fix freeze testing that should be addressed before 23.2 goes out the door:

• CPPAPI item in installer is missing a description
• GitHub Workflow for Mac Releases still includes 10.15, which is removed on GHA

[Myoldmopar]

I got an error during installation because I had a stray man page left over from an old install of E+. It popped up a dialog saying it couldn't create the man1 directory or the man file symlink itself, and on the command line I got:

/usr/bin/mkdir: cannot create directory ‘/usr/local/share/man/man1’: File exists

I installed it into /tmp so that I wouldn't need sudo for most of the install, and it properly asked me to elevate once it tried to create the man page stuff. I think it's just a matter of deleting the old one if it exists before creating the new one.

• Fix man page install

[jmarrec]

Re the man page, that is surprising. https://github.com/NREL/EnergyPlus/blob/2ad5b542c761abde2179225b08ce7af0b94a5d3b/cmake/qtifw/install_unix_createsymlinks.qs#L69-L74

mkdir -p /dir/ insn't supposed to complain if the directory is existing

$ ls /usr/local/share/man/man1
bear.1  citnames.1  ctags.1  energyplus.1  entr.1  include-what-you-use.1  intercept.1  mold.1  plocate.1  pwsh.1.gz  readtags.1
$ mkdir -p /usr/local/share/man/man1
$ echo $?
0

Same for the simlink, we pass ln -sf, the -f is there to override

[jmarrec]

was that on macOS or Ubuntu?

Site note, but the man page is outdated. Missing "--convert" and "--convert-only" at least. (Since the CLI has a "--help", not sure this is really needed...)