fix bitmap plot screen location #148
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the bitmap plot code was always plotting based on the top-left corner of the bitmap. when using OS coordinates this is incorrect behaviour - plot location should be based on the bottom-left corner, as per Acorn GXR this fixes that behaviour
fixes issue with capturing bitmap to buffer zero (the `createBuffer` call was preventing creation of buffer with ID 0, as it can’t be used as a place to redirect output) fixes recently introduced bug with behaviour of VDU 23,27,3 caused by changes to drawBitmap which was compensating for the height of the bitmap when it should only do that for plot calls
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the recently added bitmap plot code was always plotting based on the top-left corner of the bitmap. when using OS coordinates this is incorrect behaviour - plot location should be based on the bottom-left corner, as per Acorn GXR
this fixes that behaviour