Squashed 'cmake/' changes from 0e62330..1a2f2bf

1a2f2bf SlothAddTarget: make use of usage requirements of CMake 2.8.13
e07d25f SlothTools: added command to split list of libraries in optimized and debug
491ae79 SlothImport: propagate requirements, turn include directories into absolute paths
4f39dcd SlothAddTarget: cleanup; added support for compile options
fe923da SlothDump: added utility do dump properties of a target
422fb3b SlothTools: ignore generator expressions in sloth_list_filename_component function
10a04ab SlothRemote: can also create a build time target

git-subtree-dir: cmake
git-subtree-split: 1a2f2bf8096bc1f9de910fd536fc6c942d5284b1
Merge commit '7075c50c7ada3783e788c126c17d90573ef9a707'
Updat to work with latest sloth-cmake