New map generator added (and SQLite, messed up the commits at that time...) (import from temporary git repo)

Moved some mapnode content stuff from mapnode.{h,cpp} and digging property stuff from material.cpp to content_mapnode.{h,cpp}

configwriting/saving isn't complete and will break your config if you use fancy keys

--HG--
rename : src/licensecomment.txt => licensecomment.txt