Revert "UnitDef: support double-resolution yardmaps for buildings"

This reverts commit f92ef31ee91a4a4e1f30e463f0a2509c5ce6f1e8.
check demos for desyncs in all SYNCCHECK builds
update pr-downloader: fix depends where not downloaded
fix #3408 (wrong doc string for globallos)
AAI: fix XTA config, AAI now only works with XTA>9.71
fix fallback log
fix #3442 (multiple build-started sounds, NOT a game issue)
addendum
AAI: addition to 2adb14c1db52d4ca741c093bb3d9ac4691afed34
qtpfs: minor style tweak
fix missing return
fix nanoframe jitter for being-built gmt units (minor)
fix: call Factory::SendToEmptySpot iff new unit has no orders of its own
QTPFS: don't desync if called from unsynced
fix GrassDrawer crash after 1c682f6ba3
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fix #3448
addendum
LoadScreen: add config-option ShowLoadMessages (default true)
buildbot: fix linking by adding tiff/png linking
QTPFS: remove PathRectangle again, no longer needed