patch 8.0.0992: terminal title is wrong when 'encoding' is DBCS

Problem:    Terminal title is wrong when 'encoding' is DBCS.
Solution:   Convert the title from DBCS to utf-8. (Yasuhiro Matsumoto, closes
            vim#2009)

patch 8.0.0991: using wrong character conversion for DBCS

Problem:    Using wrong character conversion for DBCS.
Solution:   Use utf_char2bytes instead of mb_char2bytes. (Yasuhiro Matsumoto,
            closes vim#2012)

patch 8.0.0990: with DBCS 'encoding' wrong pasting register into term…

…inal

Problem:    When 'encoding' is a double-byte encoding, pasting a register into
            a terminal ends up with the wrong characters.
Solution:   Convert from 'encoding' to utf-8. (Yasuhiro Matsumoto, closes
            vim#2007)

patch 8.0.0989: ActiveTcl dll name has changed in 8.6.6

Problem:    ActiveTcl dll name has changed in 8.6.6.
Solution:   Adjust the makefile. (Ken Takata)

patch 8.0.0988: warning from Covscan about using NULL pointer

Problem:    Warning from Covscan about using NULL pointer.
Solution:   Add extra check for NULL. (zdohnal)

patch 8.0.0987: terminal: second byte of double-byte char wrong

Problem:    terminal: second byte of double-byte char wrong
Solution:   Set the second byte to NUL only for utf-8 and non-multibyte.

patch 8.0.0986: terminal feature always requires multi-byte feature

Problem:    Terminal feature always requires multi-byte feature.
Solution:   Remove #ifdef FEAT_MBYTE, disable terminal without multi-byte.

patch 8.0.0985: libvterm has its own idea of character width

Problem:    Libvterm has its own idea of character width.
Solution:   Use the Vim functions for character width and composing to avoid a
            mismatch. (idea by Yasuhiro Matsumoto)

patch 8.0.0984: terminal blinking cursor not correct in the GUI

Problem:    Terminal blinking cursor not correct in the GUI.
Solution:   Set blinkoff correctly.  Also make the cursor blink on MS-Windows
            by default. (Ken Takata)

patch 8.0.0983: unnecessary check for NULL pointer

Problem:    Unnecessary check for NULL pointer.
Solution:   Remove the NULL check in dialog_changed(), it already happens in
            dialog_msg(). (Ken Takata)