Fix Qt 4 compilation.

See next commit.
Replace all uses of QT_VERSION_CHECK with explicit version.

Qt4's moc is not able to expand QT_VERSION_CHECK which may lead
to invalid codegen when used for backwards compatibility work.
Replaced all occurances with explicit check against numeric
version which are treated correctly. Even though bad interactions
might be rare we should no longer use this macro as long as we
want to compile with Qt 4. Also see:
http://lists.qt-project.org/pipermail/interest/2013-August/008351.html
Delete MumbleApplication.cpp.autosave

hacst committed this by mistake in 4efabcea5c5f6aff6de5d69500044429e8d9c053
Update project url and copyright info
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Build fixes for the debug variant of the win32-static/win64-static build envs.
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Add Microsoft Visual Studio to overlay blacklist
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Merge pull request #1390 from MumbleTransifexBot/master

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Fix Mumble build failing on OSX due to missing include.
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MainWindow: only trigger link tooltips of Mumble is the frontmost program.

Fixes #1372