* Moved campvis::Runnable interface to tgt namespace (since it's needed by sigslot, which only depends on tgt)
* Introduced sigslot::signal_manager singleton class that will manage the dispatching of signals in its own thread
* Started proof-of-concept implementation of asynchroneous signals for signal0<> and signal1<>. Both classes define their own signal_handleN deriving from _signal_handle_base, which defines the signal to dispatch.

Proof-of-concept implementation seems to work so far.

refs #384

Conflicts:
	core/tools/opengljobprocessor.h
	ext/tgt/runnable.h

Conflicts:
	application/CMakeLists.txt
	core/tools/opengljobprocessor.h

* CMake build files now support unix builds
* SWIG interface files and Lua wrappers are now fully C++ compliant to comfort GCC
* Hacked shared/static builds of the campvis-modules module even more, but now it works on both MSVC and GCC

SWIG wrappers for siglot only supported unary signals until now. This
commit adds support for all remaining signal arities to make it possible
to connect to arbitrary signals from Lua.

The implementation makes heavy use of templates but, due to the
limitations of VS 2010 (no variadic templates), still contains lots of
duplicated boilerplate code.

`sigslot.i` has been moved from `scripting/` to `ext/sigslot/` to keep
it close to the code it's wrapping.

References #1

* Introducing sigslot::signal::has_connections() to check whether a signal has listeners
* Fixed default OpenGL texture wrapping

Conflicts:
	modules/pipelinefactory.h

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@489 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@335 bb408c1c-ae56-11e1-83d9-df6b3e0c105e