Remove libnetcpp and libnoise++

LibNoise++ has been replaced by HexaNoise.
NetCPP will be replaced with libcurl soon.
Fix build status badge URL
Link libhexanoise statically
Removed libcppnet
Clang_format & cosmetic fixes
Added HNDL object placer terrain module
Moving terrain gen to HNDL
Uniform initialization does not work in gcc

Fixes #46
Fix material names for mc_tree.hbs.txt
Fix segfault on exit