[texworks] Qt5 support

[Vladimir Lomov]

Hello,
I made a patch that allows me to compile TeXworks from SVN on my system
with Qt 5.4.

Unfortunately, these changes make impossible to compile TeXworks vs Qt4.
In case questions I would be glab to comment proposed patch.

---
WBR, Vladimir Lomov

-- 
Q:	How did you get into artificial intelligence?
A:	Seemed logical -- I didn't have any real intelligence.
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