moved time package from old arc framework
added singleton pattern and pointer
added noncopyable pattern
moved preprocessor package into core package
fixed compilererrors, added instancepointer and removed pointer
completed implementation of instance_pointer and added opaque_pointer
arc makes now use of the opaque_pointer
renamed instance_pointer to scope_pointer
fixed several compiling erros when using methods like reset, release...
added destructor for time class to avoid undefined behaviors
uncommented clock class
renamed time to cpu_time and created unix_time
changed timestamp usage from cpu_time to unix_time
removed sfml dependency from time package and added own implementation