Support per-monitor DPI aware #11
Description
Right now it's stuck in time to back when you were only globally DPI aware and per-monitor DPI wasn't a thing yet.
Currently, font scaling is computed once with MulDiv on LOGPIXELSY and I get one value.
PerformSlotting and/or GetMonitorGeom work weird. If the primary has more scaling, the secondary monitors will end up rendering out of bounds. I'm not sure where scaling would need to be taken into account. Maybe need more calls to ClientToScreen? Will see.