These turn into errors because of our -Werror use, breaking the build.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Remove any blank lines at the end of all source files

When using config.h, it must be the very first include in all source
files since it contains #define that may change the compilation process
(eg libc structure layout changes when it's used to enable large file
support on 32 bit x86 archs). This commit adds it at the beginning
of all .c and .cpp files

cegui doesn't include stddef required for ptrdiff_t type, we
include it for it.

This stops the client from dropping CEGUI.log files into the cwd all
the time, and stops it from crashing when the cwd is not writable
(rhbz#650253).

Now that Application::hide_me actually does what the name suggests
(hide the entire client, ie all client windows), the gui using it to
not show the gui layer leads to the entire client disappearing when
one presses close in the GUI or dismisses a GUI dialog. This patch makes
the GUI code call hide_gui instead of hide_me, fixing this.

letancy -> latency
compund -> compound
SpicedSubMessage -> SpiceSubMessage
modifaiers -> modifiers
massage -> message
outgoiong -> outgoing
AlphaBlnd -> AlphaBlend
remoth -> remote
modifires -> modifiers
secore -> secure

This makes the CEGUI dependency optional and off by default. Restoring
previous behaviour of exiting on disconnect if disabled.