Reduced header file inclusions

[Jens Seidel]

Hi Robby,

I noticed that you normally try to minimize header inclusions. I checked
all header files in src/ for not needed #include statements and was able
to remove a few.

Now you can drink an additional cup of coffee in the time which this
patch saves you during compilation :-)

Once the compiler complained about an undefined "uint" which is probably
defined in a KDE or Qt header file. Please avoid using it for
compatibility reasons.

The alias uint for unsigned int is defined in sys/types.h on POSIX
systems only. It is also available in pre C99 systems. ISO C99 provides
int8_t, ... in stdint.h but no uint.

I think it is also a good idea to declare classes *after* header file
inclusion only. The reason is simple: If you include a header file file.h
which depends on a class X you will not get an error if you forgot to
declare X inside file.h (at least if X is defined before inclusion of
file.h).

OK:

#include "file.h"
class X;

Not suggested:

class X;
#include "file.h"

(It could also be possible, that file.h gets parsed differently
dependant on whether X is declared or not. At least this is possible
with #define statements!).

Jens
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