Moved tnlObject_impl.h back to tnlObject.cpp since function definitions
in header files cause duplicates when building libtnl. The constructor
of tnlObject is __cuda_callable__ so it's empty definition was moved
directly to tnlObject.h to make it visible to nvcc.

Renaming getParameterType to getType.

with template build configuration to speed-up the build process.

Adding an exception to tnlAssert.

Explicit instantiation of template CUDA reduction.

Adding unit tests for tnlString, tnlObject and tnlArrayManager.

There is gap of missing commits.