Qt → wireshark. GTK+ → wireshark-gtk.

Make sure the Qt UI is named "Wireshark" and its executable is named
"wireshark" or "wireshark.exe". Make sure the GTK+ UI is named
"Wireshark 1" or "Wireshark (GTK+)" depending on how much the target
audience is likely to care about UI toolkits. Make sure the GTK+
executable is named "wireshark-gtk" or "wireshark-gtk.exe".

It looks like moving to Qt 5.3 (g978faf3) broke the PortableApps
package. It's likely even more broken now.

Autotools out-of-tree builds also broke on Ubuntu 12.02 (automake
1.11.3) at some point. The first attempt to compile in ui/qt returns
"error: source_file.cpp: No such file or directory". The second attempt
works. Out-of-tree builds work fine on Ubuntu 14.04 (automake 1.14.1).

Tested:

- Nmake builds

- NSIS packaging

- CMake builds (Windows, OS X)

- Autotools build and distcheck

- RPM packaging

To do:

- Test Debian packaging

- Fix PortableApps

Change-Id: I66429870e05fd2d6fc901942477959ed6164fce2
Reviewed-on: https://code.wireshark.org/review/3919
Reviewed-by: Gerald Combs <gerald@wireshark.org>