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* If enabled it causes this annoying system alert sound to be played each time BOINC spawned our app via its screensaver!

* Avoids changing the mode from the default to the disired state
* Doesn't trigger powerd on macOS (no issue, just optimizing)

* Turns out that the initial window resize (via --fullscreen) still caused a mouse move event after the existing check
* The event only gets triggered if the mouse pointer is in the lower left display area (where the initial window "appears" before resizing)
* The event itself never indicates a real move (via xrel/yrel), so that should make the check reliable now!

* Sometimes window events are received prematurely (probably caused by the initial window resizing)
* Ignore window events until the window is actually visible

* Required to support macOS 10.13+
* Our graphics app acts as a Mach RPC server that passes IOSurfaces to registered clients
* The BOINC screensaver acts as a Mach RPC server, rendering the IOSurface received
* Patching the BOINC build to include the required files (missing in non-Xcode build)
* Added MacIOSurfaceManager that sets up the Mach RPC server and controls the IOSurface textures
* Integrated the MacIOSurfaceManager into our WindowManager
* Note: we need to watch for upstream changes to macglutfix.m to retain compatibility

References:

* https://github.com/BOINC/boinc/pull/2149
* https://github.com/BOINC/boinc/blob/master/api/macglutfix.m
* https://developer.apple.com/library/archive/samplecode/MultiGPUIOSurface/Introduction/Intro.html

* The layout now scales with the display's pixel density (DPI)
* Refreshed the layout to make it more readable
* The DPI used to design the reference layout must always
  be kept in sync with AbstractGraphicsEngine::DESIGN_DPI
* Tested on macOS 10.15.7 across all scaling factors

* BOINC passes IOSurfaces via Mach RPC as of 10.13
* This hopefully enables compatibility with it, according to Apple:
  https://developer.apple.com/library/archive/samplecode/MultiGPUIOSurface/Introduction/Intro.html
* Older macOS version can still use the old 32 bit builds

* SDL broke macOS < 10.10 support here: https://hg.libsdl.org/SDL/rev/25c5f567de44
* Even Apple has it wrong (vvailability vs. examples): https://developer.apple.com/documentation/foundation/nsoperatingsystemversion
* Regression in 1340b7b9

* Switching from obsolete configure option to API call
* Since SDL 2.0.2 screensavers are disabled by default!
* https://wiki.libsdl.org/SDL_IsScreenSaverEnabled

Link libstdc++ statically (avoid dependency)

See merge request !3

* -static-libstdc++ isn't effective despite g++ driver
* Provide full path to static libary instead

* Not sure these are needed anymore
* Having them lead to double-include issues I couldn't resolve
* Works just fine without it
* Newer SDKs should be fine as long as we keep the desired deployment target

Move macOS build to 64 bit

See merge request !1

* Previously used FYI only
* Defaults are better than explicit values