* Update JsonCPP to 1.8.3
* Fix deprecated functions
Json::FastWriter, Json::StyledWriter and Json::Reader are marked deprecated since 1.1 and are deprecated in 0.8 but not shown at compilation time.
Use new methods to serialize/deserialize
* Update embedded jsoncpp from unk version to 0.10.6
0.10.6 is last release without c++11
* Make jsoncpp more compliant with its amalgamate
Jsoncpp cpp file should be upper, make the library like it does in amalgamate
* Reorganization: move minetest embedded libs outside of source tree to /lib
* Fix a dead grep in LINT
