PR pkg/24534.
Changes:
* Added contrib/scrollbar/pixmap_engine, which eases adding your
original scrollbars to mlterm.
* Shrunk used memory if many font names specified in ~/.mlterm/*font files.
* Added tool/viewsfml.
* Garbage multi-byte characters were often left in a screen. Fixed.
* Partially ported kiklib to MS Windows.
* Added -%,--logseq,logging_vt_seq option.
* Revivied mlterm configuration protocol 5380, added mlcc and
w3mmlconfig again.
* Supported window grouping.
* ml_char_t is 64bit in LP64, not 96bit.
* Fixed many bugs, cleaned many codes, and updated documentations.
9aeb6f3d5e