Doxygen work

* Fixed install directory
* Fixed include paths
Added Doxygen documentation for pkmn::move class

* Fixed get_priority() return type exposed by writing docs
docs: added brief Doxygen description for pkmn::move
Added Doxygen docs for pkmn::item and paths.hpp functions
swig: C# and Java fixes
Added Doxygen docs for C# and Java...a lot of tweaking to do
docs: ignore JNI and PINVOKE files
Doxygen fixes
docs: ignore base class files for C# and Java