change a forward type declaration into a struct

git-svn-id: http://svn.gna.org/svn/wesnoth/trunk@56377 75b3775d-3801-0410-9e12-e2e43121521d
add movetype.hpp/cpp to VC project

git-svn-id: http://svn.gna.org/svn/wesnoth/trunk@56378 75b3775d-3801-0410-9e12-e2e43121521d