Fixed some wrong CMake HEADER/SOURCE entries.
Added installation of header files.
Added some more forgotten header files.
Moved libmapcraftercore files into separate directory.
Removed unnecessary direct dependencies from libmapcraftercore.
(boost program options / test are only needed for the programs
using libmapcraftercore)
Moved tools/ from mapcraftercore/ to src/.
Fixed some small issues with make runtests / make gen_texture_code.
Fixed #include of mapcraftercore in mapcrafter.cpp
Fixed some files installed with CMake.
Added an option to skip installing the libmapcraftercore headers.
Merge branch 'mapcrafter_library'