Fixes #270

Unfortunately HP ships a buggy X server on their thin clients
that send out extra, bogus ShmCompletion events. This screws up our
logic so we need to filter them out. Fortunately they are sent with
an invalid drawable id, so simply verify that.

We haven't supported them in a long time so we shouldn't mention
them in the interface and documentation.

Previously the incoming clipboard was unconditionally set to both
the PRIMARY and CLIPBOARD selection. This isn't always what the
user want, so make it configurable.

These files are not Red Hat or Ubuntu specific, so install them
on all Unix systems where the viewer is installed.

Primary selection is inherently a X11 concept so there is no point
showing the settings related to it on other platforms.

We need to make sure the display server has finished reading our
previous update before we overwrite the buffer with the next update.

The damage tracking region needs to be protected from multiple
threads accessing it at once. The rest should be fine though.

We need more callbacks for correct operation of multi-threaded
rect decoding.

Done in preparation for multi-core decoding. Keeps the complexity
out of the other classes. This also moves ownership of the
framebuffer in to CConnection. It's the CConnection object that is
aware of the threads and how to synchronise with them. Therefore
the ownership of the framebuffer must also be there to make sure
it isn't deleted whilst threads are working.

It is easier to control object life time and avoid magical socket
duplication by having a single TcpListener object to pass around.
We have to be more careful about deleting the object though.

Makes it easier to see which hot-keys might conflict with each
other, and allow some variation in translation in the future.

Primarily gives it a shorthand, but also make gcc tolerate its
use for format strings.

It's defined in gettext.h so no need for us to duplicate the work.

It should be possible to exit the viewer even if the network has
stalled in the middle of a transfer.

Normally we only display screen changes once we have the updates for
the entire screen. This may give the impression that the viewer is
hung though. So display the partial data if the update is taking to
long to arrive.

There has been some confusion if fillRect() should accept a buffer
or a pixel. This can cause misrendering if your data is not in the
native endian order. A buffer makes more sense here though, and
is what most of the callers are already assuming, so change the
API to follow that.

It doesn't really make sense anymore given that settings might come
from the GUI or configuration and not only the command line.

It was actually a feature to translate the about string multiple
times as we may need different character encodings for it. We
still want a better approach that allows the compiler to analyse
the format string though so it isn't just a simple revert.

The TcpListener constructor now takes a 'struct sockaddr*' instead of
a string, and the createTcpListeners function creates TcpListener
instances for an address based on the results from getaddrinfo().

The XserverDesktop class now takes a list of TcpListener instances for
each of the RFB and HTTP sockets.

The TcpListener::closeFd member variable is not used and has been
removed.

The constants used here are unsigned so it makes more sense that
the parameters are as well.

Either by casting, or switching to a more appropriate type
for the variable.

We don't want it automatically creating submenus when least
expected.

This reverts commit e95412569b
and commit 52a18150a7.

The copy() method unfortunately has its own problems so it was not
a good replacement.

Less risk for bugs this way.