succesful build & debug

- massive GUI reorganisation, removed material, draw_proc is now
completely client-side
- introduced stylesheets to simplify client-coded rect's derivatives
- divided default rect::event_proc(m) into tasks in functions handle_*
- further texting tasks separation, introduced text namespace,
introduced draft_interface, massive revision of drafter/printer
algorithms with comments
- introduced variants of add_quad
- added checkbox/checklabel classes to framework