Added a function to LiquidCrystal to tweak the memory offset of the rows... #2273
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Some LCD screens have different memory offsets for the start of their rows, such as the MC41605B6W-SPR. On the datasheet it says that row 0 starts at 0x00, row 1 starts at 0x40, row 2 starts at 0x10 and row 3 at 0x50. The LiquidCrystal::setRowOffsets() function allows these offsets to be tweaked so the LiquidCrystal::setCursor() function puts the cursor to the right place even with different memory layouts.