add SDL2 mac frameworks for anyone crazy enough to build there
upstream imports r1307

eihrul:
      texturedata fix
      fix extension debug print
      doargs command
      doargs usage
      minimap shader fix
      no dynlights in minimap
      fix missing )
      minimap farplane fix
      remove some old command-line options
      command-line option fix
      networked calclight
      floor/ceil/round commands
      clean up gamma/vsync initialization
      delay res changing
      ui cleanup
      desktopw/desktoph vars
      nominimapcolour var
      hexcolor usage
update launch script
reference loop commands
make argument order of r_loop commands consistent with regular loops
reflect this in scripts
make r_local_set multiref compatible
fix logic guffaw
 fix sendsignal for multiref targets
allow statusgroup specific area particle effects
rpgchar::hit handles friendlyfire self hits
don't apply damage compass twice
fix rpgchar::use for large equipped item stacks, eg, magic sword with limited charges
make r_journal_loop_entries more consistant with other loops
restore timer countdown if the timer is already set by the game during loading
the years, they keep on, a changin'
pushref variant for adding list objects directly to other references and other misc fixes