fix graphing a bit, don't show perf graphs by default

ironically, they affect performance..on my laptop at least. that doesn't
negate their uses at all, as it shouldn't really affect the frametime
itself at all (or at least it has not), not to mention things like
packet counts and server frametime are important.
move chatview to bottom-left corner of screen properly.
rm dead code, (in theory) restore crosshair render call

in reality the position is off becaause of what was changed in the port
to qt (in the mousePositionToWorldCords function)
fix mouse position on client not updating properly unless mouse pressed

hoverEnabled needed to be on in the MouseArea (could have sworn I
enabled that but whatever)