3.1.2rc7

• Send current Z layer to SimplyPrint, uses @simplyprint layer # in slicer after layer change gcode
• Switched to _settings.get from _settings.get_int for public_port to avoid conversion errors
• Check for existence of iwlist and iwgetid in 2 paths for determining ssid name to handle different devices, returns early if neither is found
• attempt to connect to printer 3 times with increasing delay if error occurs during file upload/start process, if successful will select file.
• Additional handling of internal OctoPrint @PAUSE commands to allow passing additional information to SP using &pause_message=<message after @PAUSE>
• Additional pause handling for Prusa filament runout/pause
• Threaded download process, but keep in loop with ping to SP server with querystring &file_downloading=true&filename={filename}
• Now downloads files into SimplyPrint sub folder
• Added additional resource details using a stripped down version of Resource Monitors monitor.py as querystring &health= with value of url quoted json string of available details.