counts in termcap/terminfo entries.

Update scrollback to use vmem_gettext()
Update all the things I previously updated for the new cterm_init() prototype

So now I expect things to work again... though X11 mode may have issues,
and SDL overlay mode is dog slow.

We're switching to TrueColor now, and maintaining a 65536 entry palette
for the various palettized bits.  This change hurts the overlay output most
since it currently means floating point calculations for every pixel.

The getfont() function now takes a fontnum argument so you can get all the
current fonts.

The vmem array now holds the font data, so once a glyph is written to the
screen, it can stay in that font "forever".  This still has some issues
with savescreen()/restorescreen() since there's no extension to grab the new
stuff... that'll be coming soon, likely replacing the pgettext() and
pputtext() functions.  For now, various popups will likely reset fonts to
the default font on the screen.

Now that we have all this, the status bar in SyncTERM can retain the default
font and colours at all times.  Further, menus can be displayed in the "right"
colours and fonts, and no more translation will be needed.  This is a work
in progress though, so there's likely to be glitches.  The scrollback doesn't
have the font data either (same issue as savescreen()/restorescreen()).

Bin-capture w/SAUCE:
- Endian-fix the one multi-byte SAUCE field we use, just in cas someone someday
  builds SyncTERM on a big-endian system again.
- Work-around MinGW packed-struct bug: write every field of the SAUCE record
  separately (<sigh>).
- Set the ICE color flag when the "NOBLINK" attribute is set. We should consider
  maybe just stripping (masking-off) the blink attributes entirely when BGBRIGHT
  is not set, but NOBLINK is set.

- we now need base64.c and md5.c to compile syncterm
- the reference to conio was still the non-SDL version of conio

This allows using subdirectories etc.

APC SyncTERM:C;S;<fname>;<b64> ST
- Creates a file named <fname> in the cache directory and saves the decoded
  <b64> binary data in it.

APC SyncTERM:C;L[;<mask>] ST
- Returns a list of files in the cache directory with their MD5 checksums.
  Return value is in the format:
  APC SyncTERM:C;L\n<entries> ST
  Where <entries> is a series of filename/MD5 pairs separated by tabs and
  terminated by newlines.  So if there was a single zero-byte file:
  APC SyncTERM:C;L\nZero\t201e201e201e201e201e201e201e201e\n ST

APC SyncTERM:C;SetFont;<slot>;<name> ST
- Sets font slot <slot> to contain the <name> font.

This may all get an overhaul in the near future, but likely wont.  This API
was mostly for image and audio data, not so much for fonts, but since font
stuff is already here, it's a simple way to test things.

This also brings up undefined behaviour when an active font is changed...
We likely need to do something about that now too.

The pty speed apparently defaults to 50 baud on some systems, and some
vi versions will reduce the number of displayed lines for slow terminals.

(that support DCS strings).  With this, CSI = Ps1 ; Ps2 { is deprecated and
should not be used when CTerm is newer than this commit (1.213).

Fixes sixels disappearing with selection issue.

Scrollback and everything should now be working correctly with XTerm-256
colours.

term.c:2156:17: warning: operation on ‘cterm->log’ may be undefined [-Wsequence-point]
       cterm->log=cterm->log |= CTERM_LOG_PAUSED;