Added SokobanPlus enabled flag.
Added better info to VERSION and separated SONAME version from package ver.
.so files are installes to lib/ not lib/library_name/

For /usr/local installs, this allows them to be found by ldconfig easily

For /usr installs, this is recommended by Linux packaging
Changed what CMake targets get built by default.
Renamed namespace and library from 'sokoengine_qt' to 'sokoengineqt'
Initial debian package configuration

Needs more work on it, but it does create all packages without errors.
Added proper "Build-Depends:" for source package.
Tested packages build with pbuilder on Debian sid
Moved res/debian_initial to debian
Added 'make package' target.
Packaging docs
Merge branch 'feature/debian_package' into development
Cleanup