Documentation improvements

Signed-off-by: Drew DeVault <sir@cmpwn.com>

add resumeraw() and suspendraw()

Needed eg. to print the output of a subprocess correctly
(output of exec::start when running inside a program that is using vt).

Signed-off-by: Curtis Arthaud <uku82@gmx.fr>

drop redundant check for fullwidth

which btw was wrong (should have returned 2 rather than 1).

Signed-off-by: Curtis Arthaud <uku82@gmx.fr>

export rune_width

Signed-off-by: Curtis Arthaud <uku82@gmx.fr>

update hare

Signed-off-by: Curtis Arthaud <uku82@gmx.fr>

Fix build

vt::getcur: new function

vt/xterm: read from term.in

vt::open: update fs::flag usage

Add default enum members to make harec happy

Add vt::getsize

Implement vt::move

vt: implement cursor enable/disable and alt display

Add vt::clear

vt/xterm.ha: merge eof into xterm struct

Merge input handling into driver

vt::print: restore previous pen

xterm: implement xterm_read

vt/README: initial commit

Move chpen into xterm driver