Fix issue with tray icon double clicking.

When clicking the tray icon in rapid succession on
windows the next click on it wouldn't register.
Analysis showed the signal really didn't reach the
handler. It seems like there are some bad things
happening when calling activateWindow() in this
handler as when it is called this issue disappears.
As our setWindowState call should perform window
activation anyways we now simply rely on it and
remove the other call. Also unified both track
click handlers.

Fixes #1452
Transifex translation update

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Closes #1450
Added Windows 10 in OS detection and manifest file.

The official name for the server version of Windows 10
is "Windows 10 Server Technical Preview" but since
"Technical Preview" is a detail, I haven't included it.

Closes #1435
Revert "Fix issue with tray icon double clicking."

This reverts commit a120c8eb28c0dfcdfdb0981c63147bb37d45df2c.

Turns out this prevented Mumble from being able to raise
itself in front of a maximized application. The click
not being reported after using the activateWindow function
is probably a Qt bug and if it's reproducible in a small
sample should be reported.
Update WoW plugin to build 19103

Update the WoW plugin again, clean up some of the old code that's not
necessary, and add solution by @hacst to append realm name to identity
so it's actually useful now.
Fixed typo in the main README
Transifex translation update

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Closes #1454
Overlay, OverlayClient: add PID and process name diagnostics to 'Dead client detected' notice.
Add Spotify to the overlay blacklist. It can cause Mumble to freeze/hang for multiple seconds.

Diagnosed using the updated dead client notice added
in fd782c3cb24235be2337b71f1e411240c4c112f1.
Ensure up-to-date built-in overlay blacklist.

This changeset makes the following modifications:

 1. The overlay DLL is changed to always consider the built-in blacklist,
    even if a blacklist is present in the registry.
    For Mumble users who have been running with the old blacklist behavior,
    this means that we'll be doing some duplicate checking for blacklist
    entries, but I don't think this matters in practice.

 2. Settings.cpp is changed to not do anything with overlay_blacklist.h.
    Effectively, this means that qslBlacklist now represents the items
    the user has added to the blacklist, and not the combination of both
    an outdated built-in list and the user's own entries.

 3. OverlayConfig.cpp is changed to always show all entries from
    overlay_blacklist.h. Entries from the built-in list are 'disabled',
    so they can't be interacted with.

For more information, see PR #1461
Fix compilation of Overlay.cpp. It was accidentally broken by fd782c3c.