Doc all pub/prot members, remove unused, add todo

- Made sure all public+protected members are documented.

- Reclassified some private -> protected:
   > vscroll_width()

- Removed signatures for unimplemented (non-existant) methods:
   > u8c_cursor(void)
   > history_use(int,bool)
   > cursor_h()

- Reclassified some protected -> private:
   > x_to_glob_col()
   > xy_to_glob_rowcol()
   > is_hist_ring_row()
   > is_disp_ring_row()
   > handle_ctrl()
   > is_printable()
   > is_ctrl()
   ..etc..
   > handle_selection_autoscroll()
   > handle_selection()
   > is_redraw_style

- Add todo for ESC 7 and ESC 8
- Small code formatting mods
- Small typos

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