www/nsm: Update to 1.23

Changelog picked from https://github.com/nifty-site-manager/nsm/releases:

Nift (aka nsm) v1.23
Release Notes:
    fixed Windows bugs and tidied up with pre/post build/serve scripts and @script, @scriptoutput, @scriptraw
    fixed indenting inside pre blocks with methods to input from file
    added allowing quoted string variable names with whitespace and open brackets
    improved filenames for temporary files
    added syntax @\n to template language
    added in syntax for Nift comments to template language:
        <@-- .. --@> (raw multi line comment)
        @/* .. @*/ (parsed multi line comment)
        @--- .. @--- (parsed special multi line comment)
        @# (raw single line comment)
        @// (parsed single line comment)
        @!\n (parsed special single line comment)

Nift (aka nsm) v1.22
Release Notes:
    added in scriptExt to config files, better way to do pre/post build/serve scripts
    added command new-script-ext (page-name) scriptExt
    changed/improved how pre/post build/serve scripts are done
    hopefully fixed bugs with @script, @scriptoutput, @scriptraw functions
    added optional parameter string parameter to @script, @scriptoutput, @scriptraw functions
    updated Nift info commands with additional page information
    added pageinfo syntax @pagecontentext, @pagepageext, @pagescriptext to template language
    added siteinfo syntax @scriptext to template language
    added in buildThreads to config files
    added command no-build-thrds (no-threads)


(ng0)