[wp] removed semantics dir

src/plugins/wp/semantics/Cil.v

src/plugins/wp/semantics/Datatype.v

src/plugins/wp/semantics/Layout.v

src/plugins/wp/semantics/Machine.v

src/plugins/wp/semantics/Makefile

src/plugins/wp/semantics/Pointer.v

src/plugins/wp/semantics/Primitive.v

src/plugins/wp/semantics/Semantics.v

src/plugins/wp/semantics/Typing.v

src/plugins/wp/semantics/Values.v

src/plugins/wp/semantics/coqide.sh