add support for differing A00 and A02 charset variants for HD44780 ROM/custom encoder, map some polish (latin-enhanced A) chars
introduce GUI setting to fully disable extra element support (e.g. icons and bars on imonlcd's), closes
https://github.com/herrnst/script.xbmc.lcdproc/issues/11
remove redundant extraicon clearing from ShutDown() and have functionality in CloseSocket()