Use MemoryStream for saving Layouts as well
Use MemoryStream for saving Layouts as well

The other commit only fixed saving Splits and Settings

Resolves #269

Fluzzarn/LiveSplit,zoton2/LiveSplit,kugelrund/LiveSplit,Jiiks/LiveSplit,stoye/LiveSplit,chloe747/LiveSplit,Dalet/LiveSplit,ROMaster2/LiveSplit,ROMaster2/LiveSplit,kugelrund/LiveSplit,kugelrund/LiveSplit,PackSciences/LiveSplit,zoton2/LiveSplit,Fluzzarn/LiveSplit,Jiiks/LiveSplit,Jiiks/LiveSplit,PackSciences/LiveSplit,Glurmo/LiveSplit,LiveSplit/LiveSplit,chloe747/LiveSplit,Fluzzarn/LiveSplit,stoye/LiveSplit,ROMaster2/LiveSplit,PackSciences/LiveSplit,stoye/LiveSplit,chloe747/LiveSplit,Dalet/LiveSplit,Glurmo/LiveSplit,zoton2/LiveSplit,Dalet/LiveSplit,Glurmo/LiveSplit