Use regular expressions instead of Lua patterns for find and replace editor commands.
Syntax files can now use regex or Lua patterns as before keeping backward compatibility for plugins.
Add a Meson option "portable" to choose between "portable" and unix-like
directories. Add information about this option in the README.
To determine the user's directory use the variable USERPROFILE only on
Windows and use HOME otherwise.
Implement the "portable" option in the package build script.
On macOS, we want to use `mkstemp` rather than `tmpnam`. Enable
POSIX support in Lua to fix that (and some other things). Since
POSIX support also enables the flag for POPEN, we no longer need
to do that directly for Linux.
Adam
Takase
Francesco Abbate
rxi
Bruce Mitchener