First, add automatic detection of toolkit DPI scaling options. For now, this
is, in order,
* Check the GDK_SCALE option under GTK+ (users can set this to force the scaling)
* Check the value from WX's GetContentScalingFactor(). This will start to work
correctly from WX 3.1 and GTK+ 3.10.
Then, add a user-settable override in the main prefs panel, next to the icon
scaling. This is independent of the icon scaling options.
DPI handling is performed in a standalone class, so they can be shared between
the prefs UI and the OpenGL backend easily. Also means Cairo could use the same
interface in future.
Also adjust the OpenGL grid drawing code to use the computed scale factor,
which avoids over-thick grids in scaled environments (the user can manually
thicken the grid if wanted).
Fixes: lp:1797308
* https://bugs.launchpad.net/kicad/+bug/1797308
Cherry-pick of: 567bdd9b9 (master)
This puts generic logic for KiCad environment vars in
one place.
Also updates the DIALOG_CONFIGURE_PATHS help to document
the new KICAD_USER_TEMPLATE_DIR and KICAD_TEMPLATE_DIR.
John Beard