prepare for update to fuzzylite 5.0

 - use system version of fuzzylite if available
 - adapt include paths
Replaced embedded copy of fuzzylite with fuzzylite 5.0

 - retrieved from
   https://github.com/fuzzylite/fuzzylite/archive/v5.0.tar.gz
 - only modification to tarball content was the removal of the examples
   directory
 - fuzzylite release 5.0 tags fuzzylite git commit c11556f
Upgraded to FuzzyLite version 5.0
Merge pull request #45 from josch/fuzzylite5.0_josch

Ok, I will try to integrate this now.