Problem: Terminal window status shows "[Scratch]".
Solution: Show "[Terminal]" when no title was set. (Yasuhiro Matsumoto)
Store the terminal title that vterm sends and use it. Update the
special buffer name. (closes#1869)
Problem: Options of a buffer for a terminal window are not set properly.
Solution: Add "terminal" value for 'buftype'. Make 'buftype' and
'bufhidden' not depend on the quickfix feature.
Also set the buffer name and show "running" or "finished" in the
window title.
Problem: No terminal emulator support. Cannot properly run commands in the
GUI. Cannot run a job interactively with an ssh connection.
Solution: Very early implementation of the :terminal command. Includes
libvterm converted to ANSI C. Many parts still missing.
