Merge branch 'release'
SpringTime: add a warning when used sleep() is too inaccurate
try to fix quick-macosx
remove support for old stabs debugsymbols (gdb is _the_ standard these days)
fix #3640
fix SEGV
fix logic
fix #3980
fix #3653
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cleanup 83c619f7ba
tweak
windows buildslave: upload unittests
SpringTime UT++
fix windows buildslave
try to fix UnitTest on validation buildslave w/o re-breaking quick-macosx
windows buildslave: retrieve UnitTest binaries from correct dir
fix typo
fix UnitTests.7z
remove engine support for gamedata/messages.tdf, fix #4002

add example widget for backwards compatibility