moved Mesh:setWireframe to love.graphics.setWireframe (affects all draws until it's disabled.)

Wireframe mode should only be used for debugging: the wireframe lines behave differently than regular lines, their widths aren't affected by the graphics scale, and the mode isn't available on OpenGL ES.

src/modules/graphics/opengl/wrap_Mesh.h

@@ -51,8 +51,6 @@ int w_Mesh_setDrawRange(lua_State *L);
 int w_Mesh_getDrawRange(lua_State *L);
 int w_Mesh_setVertexColors(lua_State *L);
 int w_Mesh_hasVertexColors(lua_State *L);
-int w_Mesh_setWireframe(lua_State *L);
-int w_Mesh_isWireframe(lua_State *L);
 
 extern "C" int luaopen_mesh(lua_State *L);