Hi all

I have fiddled with the highdpi stuff and managed Linux/Unix to join the party.

If you're interested, have a look at 
	https://github.com/OpenSmalltalk/opensmalltalk-vm/tree/krono/highdpi-v2


The main thing that changes is that primitiveScreenScaleFactor now can dynamically determine what
scale to use for a monitor. Per se, that does nothing, but the DpiAware -Changeset below allows
Morphic and graphics to react to that.

This should work on
	- OSX (CoreGraphics, OpenGL, Metal)
	- Windows
	- Linux (X11, fbdev)

I think this might be especially interesting for Tony and Christoph, among others.

Things to Note:
- Windows needs a manifest. This can be tricky. See
	https://github.com/OpenSmalltalk/opensmalltalk-vm/blob/krono/highdpi-v2/scripts/ci/travis_build.sh#L21
  	https://github.com/OpenSmalltalk/opensmalltalk-vm/compare/Cog...krono/highdpi-v2#diff-f0c6c15289ff7521735d7e74a350903dL15
- Mac needs a customized Info.plist
	https://github.com/OpenSmalltalk/opensmalltalk-vm/compare/Cog...krono/highdpi-v2#diff-9bc015b0fdf6b3aa927c5e49b2d882b9R129
- Linux can be a mess.
  There are now a few Environment variables to help out:
	https://github.com/OpenSmalltalk/opensmalltalk-vm/blob/a2690b1b4e5c4488c716613f6654a74e31fa018a/platforms/unix/vm/sqUnixDisplayHelpers.h
  Multimonitor people might want to set 
	SQUEAK_DISPLAY_PER_MONITOR_SCALE=1
  Tony on the Phone might want to set
	SQUEAK_DISPLAY_PREFER_PHYSICAL_SCALE=1


Have fun and play around :)

Best regards
	-Tobias


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