SlothRemote: can also create a build time target
SlothTools: ignore generator expressions in sloth_list_filename_component function
SlothDump: added utility do dump properties of a target
SlothAddTarget: cleanup; added support for compile options
SlothImport: propagate requirements, turn include directories into absolute paths
SlothTools: added command to split list of libraries in optimized and debug
SlothAddTarget: make use of usage requirements of CMake 2.8.13