Turn to mesh modifier for curves

right now you have to convert curves to mesh if you want to model anything out / with them. You can't use extruded curves for booleans or skin over multiple curves and keep them editable, very useful modelling techniques in other packages. Give us a modifier to convert curves into mesh so following actions can work with meshes, while retaining the procedural, editable nature of curves. Having an extrude modifier instead of the build in extrude function on curves would be helpful too.