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When telling front ends to paint the screen, the terminal code treats the cursor as an attribute applied to the character cell(s) it appears in. do_paint() detects changes to most such attributes by storing what it last sent to the front end in term->disptext and comparing that with what it thinks should be displayed in the window. However, before this commit the cursor was special. Its last-drawn position was recorded in special structure members and invalidated parts of the display based on those. The cursor attributes were treated as "temporary attributes" and were not saved in term->disptext. This commit regularizes this and turns the cursor attributes into normal attributes that are stored in term->disptext. This removes a bunch of special-case code in do_paint() because now the normal update code handles the cursor properly, and also removes some members from the Terminal structure. I hope it will also make future cursor-handling changes (for instance for input method pre-editing) simpler. This commit makes the required semantic changes but doesn't make the rather more pervasive change of actually renaming the attributes from TATTR_ to ATTR_. That will be in the next commit.