Alpha 1.0.18: destroying auth keys on sign up.

Also some debugging tools for mtproto endpoints added.

Alpha 1.0.17: crash fix in file open.

ShellExecute() call reenters Qt event loop, so each time we
schedule a delayed action (like destroying FileLoader) and after
that we call ShellExecute (in psOpenFile) we destroy it inside
this call and can't use it after.

So now we perform ShellExecute calls only delayed (using task queue).

Alpha 1.0.16: fighting crashes.

An attempt to fix a crash in MTP::Instance destructor + additional
logging there to find out how this crash happens.

Alpha 1.0.15: changelog added.

Version 1.0.14: crash fix in text rendering.

Fix a regression introduced in 8d35438 which caused an overflow
in _parAnalysis access. We were resizing _parAnalysis array for a
line width without the pending newline character while we used it
for painting a line including the pending newline character. It was
not a problem before, when we were trimming them from the end of
the string, but it results in a buffer overflow and crashes in the
lastest versions. So now we just don't include the newline in the
painted string, so it has exactly the same size as _parAnalysis.

Version 1.0.13: fix unnecessary window activations.

A regression was introduced in 1.0.12 version which led to wrong
activations of the main window: if a custom popup menu was shown
for the tray icon or a custom notification was clicked.

Version 1.0.12: fix initial build_defines.

Alpha 1.0.11: fix Qt 5.3.2 build.

Qt 5.3.2 QVector works only with types having an assignment operator.

Alpha 1.0.10: better changelog message.

Alpha 1.0.9: crash fix in video playback.

Media::Player::Instance started to notify about all sound
playback updates, even for video files (which do not have
DocumentData filled in), while Media::Player widgets were
relying on the existance of DocumentData in each update.